Historical primaries (Germany)

In the course of the development of the telephone network, area codes were often changed in order to free up certain number ranges. If there was a shortage of numbers in a local area network, the area code was shortened, as the total number of digits (without the traffic elimination digit 0) was limited to 10 digits. This number results from ITU recommendation E.163, according to which the international number including the country code ("49" for Germany) may have a maximum of 12 digits. In 1997 the recommendation was replaced by E.164 , which now allows 15 digits. With the previously common mechanical switching systems, additional dialer assemblies had to be installed for each additional digit, which represented a considerable cost factor.

The conversion of the GDR area codes to the all-German code system is shown in the article Telephone area code (GDR) .

Area codes in numerical order

01

012
old	New	from	Local network	comment
012-12	-	09/30/2008	Innovative services: web.de	Changeover to numbers in the range 032 -12
012-230	-	2007	Innovative services: tesion, Stuttgart	Operation stopped
012-3131	-	2007	Innovative services: BBA Netkom	Operation stopped
012-3333	-	2007	Innovative services: BBA Netkom	Operation stopped
012-3456	-	2007	Innovative services: CommAssist, Lübeck	Operation stopped
013
0130	-	2001	Freecall	Changeover to numbers in international format in the 0800 range
015
01505	-	11/16/2002	Cellular Quam	Operation stopped
016
0161	-	12/2000	Cellular C network	Operation stopped
0165	-	12/2000	Pager quix	Operation stopped
0166	-	12/2001	Pager TelMI	Operation stopped
01680 01681	-	04/2002	Pager Scall	Operation stopped
018
01888	030 18 0228 99	2009	Information network Berlin-Bonn	Operation of own preselection set
019
0190	-	01/2006	Premium services	Changeover to numbers in international format in the 0900 range

02

020
old	New	from	Local network	comment
02000	-	around 1998	Expo 2000 hotline	Discontinued
021
02101	02131	11/1991	Neuss	Reclassification of the local networks on the left bank of the Rhine into their own central exchange (KVSt) in Neuss
02105	02132	11/1991	Meerbusch- Büderich
02106	02133	11/1991	Dormagen
02107	02137	11/1991	Neuss- Norf
02120	02053	10/1982	Velbert- Neviges	Reclassification to KVSt Velbert
02121	0202	05/31/1975	Wuppertal	Shortening the area code
02122	0212	06/1985	Solingen	Shortening the area code
02123	02191	08/23/1975	Remscheid	Seat of a new KVSt
02124	02126	before 1974	Heiligenhaus	originally merged with the Velbert local network
02124	02051	10/1982	Velbert	Seat of a new KVSt
02125	02336	03/14/1984	Schwelm	Reclassification to KVSt Hagen
02126	02196	before 1974	Wermelskirchen	Reclassification to the new KVSt Remscheid
02126	02056	10/1982	Heiligenhaus	Reclassification to KVSt Velbert
02127	02052	10/1982	Velbert- Langenberg
02128	02058	10/1982	Wuelfrath
02131	0203	05/31/1975	Duisburg	Shortening the area code
02132	0208	08/23/1975	Oberhausen	Shortening the area code; Merging of two local networks
02133	0208	08/23/1975	Mülheim an der Ruhr	Shortening the area code; Merging of two local networks
02134	02064	11/1991	Dinslaken	Relocation of the KVSt Duisburg to the main exchange in Essen
02135	02065	11/1991	Duisburg-Rheinhausen
02136	02066	11/1991	Duisburg-Homberg
02141	0201	circa 1970	eat	Shortening the area code; Establishment of a new main exchange in Essen
02142	02041	circa 1977	Bottrop	Establishment of a new KVSt in Bottrop
02143	02043	circa 1977	Gladbeck	Establishment of a new KVSt in Bottrop
02144	02054	circa 1977	Essen- Kettwig	Reclassification to the new KVSt Velbert
02145	02045	circa 1977	Bottrop- Kirchhellen	Reclassification to the new KVSt Bottrop
02172	0214	1982	Leverkusen	Shortening the area code
02191	02195	before 1974	Radevormwald	Clearance of the key figure for Remscheid
02194	02120	before 1974	Velbert-Neviges	Clearance of the number pad for the new KVSt Remscheid
022
02221	0228	05/17/1980	Bonn	Shortening the area code
02229	02221	circa 1976	Bonn- Bad Godesberg	Local network dissolved and incorporated into Bonn local network
02281	02267	before 1980	Wipperfürth	Dissolution of the KVSt Wipperfürth and integration into the KVSt Gummersbach in order to clear street 0228 for Bonn
02283	02268	before 1980	Kürten
02284	02269	before 1980	Kierspe- Rönsahl
023
02321	0234	circa 1970	Bochum	Shortening the area code
02322	0209	05/31/1975	Gelsenkirchen	Shortening the area code
02350	02352	?	Old rye frame	Local network dissolved and incorporated into the Altena local network
024
024422	02482		Hellenthal	Shortening of the area codes in the KVSt Kall
024424	02484		Mechernich -Eiserfey
024425	02485		Schleiden Thorn
024426	02486		Nettersheim
025
025032	02532	circa 1975	Ostbevern	Shortening of the area codes in the KVSt Münster
025033	02533	circa 1975	Munster-Nienberge
025034	02534	circa 1975	Munster-Roxel
025035	02535	circa 1975	Sendenhorst -Albersloh
025036	02536	circa 1975	Münster-Albachten
025038	02538	circa 1975	Drensteinfurt -Rinkerode
02531	05971	circa 1975	Rheine	Reclassification of the KVSt Rheine to the main exchange in Lingen (Ems) to clear street 0253
02533	05973	circa 1975	Neuenkirchen
02535	05975	circa 1975	Rheine-Mesum
02536	05976	circa 1975	Mountains of salt
02537	05977	circa 1975	Spelle
02538	05978	circa 1975	Hörstel-Dreierwalde
026
02624	02601	before 1974	Nauort	Outsourcing from the Höhr-Grenzhausen local network
02629	0261	before 1974	Rübenach	Local network dissolved and integrated into Koblenz local network
?	02630	11/1982	Mülheim-Kärlich
02631	02632	before 1974	Then after	Outsourcing from the Neuwied local network
02631	02637	before 1974	Weißenthurm	Outsourcing from the Neuwied local network
027
02757	02752	?	Fischelbach	Local network dissolved and incorporated into the Bad Laasphe local network
027702	02770	?	Hirzenhain (Eschenburg)	Shortening of the area codes
027703	02779	?	Beilstein	Shortening of the area codes
02779	02736	?	Niederdresselnorf	Local area network dissolved in order to clear area code for shortening. Integration into the local network Burbach, Siegerland.
0279	-	09/1997	Eurosignal paging service (center)	Operation stopped
029
02970	02973 02971	around 1995	Eslohe-Cobbenrode	Local network dissolved and integration into the local networks Eslohe and Schmallenberg-Dorlar
02978	02973	around 1995	Eslohe-Reiste	Local network dissolved and incorporated into the Eslohe local network
02979	02971	around 1995	Kirchrarbach	Local network dissolved and integrated into the Schmallenberg-Dorlar local network

03

031
old	New	from	Local network	comment
0311	030	06/29/1973	Berlin (West)	Shortening the area code
033
033052	03304	10/1997	Lee break	Local network dissolved and integrated into the local network Velten, previous numbers were prefixed with 2
033081	033082	around 1996	Neuglobsow	Integration into the Menz local network
033879	039389	Late 1993	Schollene
033927	033922	07/1997	Linum	Local network dissolved and integrated into the Karwesee local network, previous numbers: leading 6 replaced by 5, 7 by 8
037
037	-	1991	Traffic area east	Shortened country code for the former GDR from the local network of Berlin (West)

04

041
old	New	from	Local network	comment
0411	040	06/29/1973	Hamburg	Shortening the area code
041862	04186	08/23/1975	Buchholz - Trelde	Shortening the area code
041863	04182	08/23/1975	Heidenau (North Heath)	Local network dissolved and integrated into the Tostedt local network
042
042012	04292		Ritterhude	Shortening of the area codes (depending on free space)
042013	04293		Ottersberg- Fischerhude
042014	04294		Vineyard
042015	04295		Emtinghausen
042016	04296		Schwanewede -Aschwarden
042017	04297		Ottersberg- Posthausen
042018	04298		Lilienthal
042452	04240	09/01/1973	Guard Village	Local network dissolved and integrated into the local network Syke-Heiligenfelde
042453	04245	09/01/1973	Neuenkirchen (near Bassum)	Shortening the area code
042652	04269		Ahausen- Kirchwalsede	Shortening the area code
042653	04265		Fintel	Shortening the area code
04291	04791	11/1974	Osterholz-Scharmbeck	Reclassification to the main exchange in Bremerhaven to clear alley 0429 for area code abbreviation
04292	04792	11/1974	Worpswede
04293	04793	11/1974	Hambergen
04294	04794	11/1974	Worpswede-Ostersode
04295	04795	11/1974	Osterholz-Scharmbeck- Garlstedt
04296	04796	11/1974	Osterholz-Scharmbeck- Teufelsmoor
043
?	04383		Schönweide , Grebin	Reclassification to the new KVSt Lütjenburg
04304	04384		Selent
04306	04385		Hohenfelde
043252	04392		Nortorf	Shortening of the area codes
043253	04393		Boostedt
043254	04394		Bokhorst
043352	04335		Derision	Shortening the area code
043353	04338		Old Duvenstedt	Shortening of the preselection (depending on free space)
04338	04331		Ostenfeld	Local network dissolved and incorporated into the local network in Rendsburg
04345	04381		Luetjenburg	New formation of the KVSt Lütjenburg
04368	04382		Döhnsdorf, Wangels	New formation of the KVSt Lütjenburg
044
044090	04480		Strückhausen	Shortening of the area codes in the KVSt Oldenburg
044091	04481		Hatten sand pitcher
044092	04482		Had
044093	04483		Great Sea
044094	04484		Wüsting
044095	04485		Huntorf
044096	04486		Friedrichsfehn
044097	04487		Huntlose
044098	04435		Ahlhorn	Local network dissolved and integration into the local network Großenkneten
04457	-		Ellenserdamm	Local network dissolved
04481	04981		Westerstede	Reclassification of the KVSt Westerstede to the main exchange in Leer (Ostfriesland) in order to clear Gasse 0448 for shortening in the KVSt Oldenburg (this reclassification was later changed again)
04482	04982		Apen
04483	04983		Barßel
04484	04984		Westerstede-Ocholt
046
04628	04627		Ellingstedt	Local network dissolved and integrated into the local network Dbodstedt
04629	04624		Jagel	Local network dissolved and integrated into the local network Kropp
04652	04651	09/1995	List (Sylt)	Numbers were prefixed with 87
04653	04651	09/1995	Hörnum (Sylt)	Numbers were prefixed with 88
04654	04651	09/1995	Sylt-East	Numbers were prefixed with 89
048
048202	04892		Schenefeld	Shortening of the area codes
048203	04893		Hohenaspe	Shortening of the area codes
049
04981	04488	1981	Westerstede	Dissolution of KVSt Westerstede, reorganization of the local networks to the main exchange in Oldenburg
04982	04489	1981	Apen
04983	04499	1981	Barßel
04984	04409	1981	Westerstede-Ocholt

05

050
old	New	from	Local network	comment
0509	-	09/1997	Eurosignal paging service (north)	Operation stopped
051
05104	05131	1st November 1974	Osterwald, Oberende	Local network dissolved and incorporated into the Garbsen local network
05106	05137		Seelze
?	05175		Huge	Local network dissolved and integrated into the Lehrte-Arpke local network
05120	05060		Bodenburg
05122	05067		Bockenem
05124	05068		Elze
05125	05069		Nordstemmen
05133	05109		Whet	Local network dissolved and integration into the local network Ronnenberg
05134	05105	1st November 1974	Barsinghausen
051402	05082		Langlingen	Shortening of the area codes
051403	05083		Scorn
051404	05084		Hambühren
051405	05085		Ehlershausen
051406	05086		Shy
05150	05155		Grohnde	Local network dissolved and integration into the Emmerthal local network
052
052052	05207		Holte Castle	Shortening the area code
05239	05252		Kohlstädt	Local network dissolved and incorporated into the Bad Lippspringe local network
05243	05423		Versmold	Reclassification from KVSt Gütersloh to KVSt Dissen
052562	05292	08/23/1975	Lichtenau- Atteln	Shortening of the area codes
052563	05293	08/23/1975	Paderborn-Dahl
052564	05294	08/23/1975	Hövelhof - Espeln
052565	05295	08/23/1975	Lichtenau
053
053052	05305		Sank	Shortening of the area codes
053053	05300		Salzgitter-Üfingen	Shortening of the area codes
054
05408	05468		Narrower	Reclassification from the KVSt Osnabrück to KVSt Bramsche
05463	05439		Bersenbrück	Reclassification from KVSt Bramsche to KVSt Quakenbrück
055
055262	05582		Sankt Andreasberg	Shortening of the area codes
055263	05583		Hohegeiß
055264	05584		Hattorf am Harz
055265	05585		Sieber
058
058012	05872		Push	Shortening of the area codes
058013	05873		Eimke
058014	05874		Soltendieck
058015	05875		Emmendorf
058472	05882		Gorleben
058473	05883		Lemgow

06

060
old	New	from	Local network	comment
060302	06002		Ober-Mörlen	Shortening of the area codes
060303	06003	after 1973	Rosbach vd H.
060304	06004		Munzenberg (today Lich-Eberstadt)
060307	06007		Rodheim vd H.
060308	06008		Echzell
060572	06057	05/31/1975	Flörsbachtal	Shortening the area code
060573	06058	05/31/1975	(Central) Gründau	Shortening the area code; all numbers with the first digit 2 received a further 2
06058	06050		Biebergemünd-Bieber	Consolidation with local network Biebergemünd-Kassel to clear code 06058 to shorten the area code
061
0611	069	08/05/1984	Frankfurt am Main	Shortening of the area codes
06121	0611	circa 1990	Wiesbaden	Shortening of the area codes
06143	06134	before 1985	Mainz-Kastel
06193	06101	09/1984	Bad Vilbel
06194	06109	09/1984	Frankfurt-Bergen-Enkheim
063
063405	06347		Hochstadt (Palatinate)	Shortening the area code
063406	06344		Schwegenheim	Shortening the area code
063422	07271	1970s	Woerth on the Rhine	Seat of a new KVSt, associated with reclassification to HVSt Karlsruhe
063423	06340		Schaidt	Shortening the area code
063424	06348		Offenbach on the Queich	Shortening the area code
063425	07273		Hagenbach (Palatinate)	Reclassification to KVSt Wörth
063426	06342		Schweigen-Rechtenbach	Shortening the area code
063427	07277		Büchelberg	Reclassification to KVSt Wörth
063428	07276		Herxheim near Landau / Pfalz
06344	07272		Rülzheim
06347	07274		Germersheim
06348	07275		Candelabra
06399	06394		Bobenthal	Local network dissolved and integrated into the Bundenthal local network
064
064012	06401		Grünberg (Hesse)	Shortening of the area codes
064013	06400	05.10.1973	Mücke (Hessen)	Shortening of the area codes
064272	06421		Weimar (Lahn)	Local network dissolved and integrated into the local network Marburg (Lahn)
064273	06427		Schönstadt	Shortening of the area codes
064372	06482		Runkel
064373	06483		Selters (Taunus)
064374	06484		Beselich
064375	06485		Nentershausen (Westerwald)
064376	06486		Katzenelnbogen (Taunus)
065
065091	06589		Kell by the lake
065092	06580		Zemmer
065093	06509		Büdlich
065094	06500		Waldrach
065095	06585		Ralingen
065096	06586		Beuren (Hunsrück)
065097	06587		Zerf
065098	06588		Pluwig
065099	06501		Langsur	Local network dissolved and integration into the local network Conc
065502	06550		Daleids	Merging and establishment of a joint local network in Irrhausen
065503	06550		Arzfeld
065504	06552		Auw at Prüm	Shortening of the area code, merging with the Olzheim local network
065505	06555		Winterspelt	Local network dissolved and integration into the Bleialf local network
06521	06781		Idar-Oberstein	Reclassification of KVSt Idar-Oberstein to HVSt Bad Kreuznach, to clear street 0652 to shorten the area codes
06522	06782		Birkenfeld (Nahe)
06523	06783		Baumholder
06524	06784		Idar-Oberstein-Weierbach
06525	06785		Mr. Stein
06526	06786		Kempfeld
06527	06787		Niederbrombach
06528	06788		Sien
06529	06789		Heimbach (Nahe)
065602	06522		Mettendorf
065603	06523		Holsthum
065604	06524		Rodershausen
065605	06525		Irrel
065606	06526		Bollendorf
065607	06527		Oberweis
06576	06575		Großlittgen	Local network dissolved and integrated into the Landscheid local network
06577	06575		Binsfeld (Eifel)	Local network dissolved and integrated into the Landscheid local network
06585	06583		Palzem	Clearance of the key figure, with the dissolution of the local network Wincheringen (previously 06583) and integration into the local network Palzem
069
-	069	06/01/1958	Luxembourg	Telephone traffic starts from several German cities, as well as from Luxembourg to several German cities
069	(+352)		Luxembourg

07

070
old	New	from	Local network	comment
0709	-	09/1997	Eurosignal paging service (south)	Operation stopped
071
071202	07073	05/31/1975	Ammerbuch	Reclassification to KVSt Tübingen
071203	07128	?	Sonnenbühl
071204	07124	?	Trochtelfingen
071205	07122	?	St. Johann
071206	07126		Burladingen-Melchingen
07122	07071	05/31/1975	Tübingen	Seat of a new KVSt
07124	07472	?	Rottenburg am Neckar
07128	07072	05/31/1975	Gomaringen	Reclassification to KVSt Tübingen
072
072202	07226		Bühl-Sand
072203	07220		Forbach-Hundsbach
073
073012	07302	05.10.1973	Pfaffenhofen an der Roth
073013	07343	05.10.1973	Obenhausen (Illertissen district)
073014	07300	05.10.1973	Roggenburg (Swabia)
074
074502	07482	?	Dettingen	Shortening of the area codes
074503	07483	?	Mühringen
074504	07484	?	Simmersfeld
074505	07485	?	Received
074506	07486	?	Salzstetten
076
076575	07727		Hammereisenbach
079
07902	07940	?	Künzelsau

08

081
old	New	from	Local network	comment
0811	089	05.10.1973	Munich	Shortening the area code
08102	08122	circa 1970	Erding	New KVSt market Swabia
08103	08121	circa 1970	Market Swabia
08105	08123	circa 1970	Moosinning
08169	0811	circa 1992	Hallbergmoos	Shortening of the area code for Munich Airport
08182	08102	05/05/1973	Höhenkirchen-Siegertsbrunn
08184	08104		Sauerlach
08185	08105	circa 1975	Gilching
083
08329	(+43 5517)	07/2003	Mittelberg	Abolition of the German area code for Austrian communities in the German economic area
083392	08392	05/05/1973	Rettenbach market
083393	08393	05/05/1973	Holzgünz
083394	08394	05/05/1973	Lautrach
083395	08395	05/05/1973	Tannheim
08365 8	(+43 5676)	07/2003	Young wood	Abolition of the German area code for Austrian communities in the German economic area
089
08902	09002	05/05/1973	Rain	Clearance 089 for ON Munich
08903	09003		Harburg (Swabia)
08904	09004		Tapfheim
08905	09005		Bissingen
08906	09006		Mertingen
08907	09007		Marxheim
08908	09008		Unterringingen
08909	09009		Kaisheim
0891	0906		Donauwörth
08921	09071		Dillingen on the Danube
08922	09072		Lauingen (Danube)
08923	09073		Gundelfingen on the Danube
08924	09074		Höchstädt on the Danube
08925	09075		Glött
08926	09076		Wittislingen
08927	09077		Bach hail
08931	09081		Nordlingen
08932	09082		Oettingen in Bavaria
08933	09083		Möttingen
08935	09085		Alerheim
08936	09086		Fremdingen
08937	09087		Marktoffingen
08938	09088		Mönchsdeggingen
08941	09091		Monheim
08942	09092		Wemding
08943	09093		Pole singing
08944	09094		Tagmersheim

09

090
old	New	from	Local network	comment
09002	09090	02/1997	Rain	Clearance of the 0900 area for value-added services
09003	09080	02/1997	Harburg (Swabia)
09004	09070	02/1997	Tapfheim
09005	09084	02/1997	Bissingen
09006	09078	02/1997	Mertingen
09007	09097	02/1997	Marxheim
09008	09089	02/1997	Bissingen - Unterringingen
09009	09099	02/1997	Kaisheim
09031	09101	circa 1970	Langenzenn	Clear the street 090 for HVSt Donauwörth
09032	09102	circa 1970	Wilhermsdorf
09033	09103	circa 1970	Cadolzburg
09034	09104	circa 1970	Emskirchen
09035	09105	circa 1970	Großhabersdorf
09036	09106	circa 1970	Erlbach market
09037	09107	circa 1970	Trautskirchen
091
091802	09180		Pyrbaum	Shortening the area code
091803	09183		Burgthann	Shortening the area code
09183	09179	08/23/1975	Freystadt	Reclassification to KVSt Roth in order to clear the key figure
093
093542	09354		Rieneck	Shortening the area code
093543	09356		Burgsinn	Shortening of the area code, amalgamation with local network middle sense
093545	06020		Neuhütten	Local network dissolved and incorporated into the Heigenbrücken local network
097
09751	09776	11/1980	Mellrichstadt	Dissolution of the KVSt Mellrichstadt, assignment of the local networks to the KVSt Bad Neustadt an der Saale
09752	09777	11/1980	Ostheim in front of the Rhön
09753	09778	11/1980	Fladungen
09754	09779	11/1980	Sondheim before the Rhön

Simplified remote dial-up service

In the early days of self-dialing remote service , there were alternative area codes for neighboring local networks that could be reached via a special traffic elimination number (usually 9). So could z. B. the number 45678 in the local network Saarbrücken can be reached nationwide via 0681 45678, from the rest of Saarland also via 93 45678. This access via shortened local area codes was called "Simplified self-dialing remote service" and has its origins in regional self-dialing networks that existed before the standardization in the area passed the German Federal Post Office.

A variant of this principle was the "local service", which linked some closely neighboring local networks by direct dialing using a single digit (mostly 8 or 9). This enabled the higher-level switching centers to be relieved. Sometimes longer combinations of digits were used. For example, the neighboring cities of Neu-Isenburg could be reached from Frankfurt and Offenbach by dialing the digits 607 and Bad Vilbel by dialing the digits 4509 directly at the local rate.

Such primaries were in operation until the mid-1980s. When they were switched off, the digits that became available could be used for new subscriber numbers in the local network. The newly acquired number blocks were usually used for digitizing the local exchanges , as the previous electromechanical exchanges with their existing subscriber lines also had to remain in operation.

In Berlin, after the fall of the Wall, 9 was used as a simplified area code for the telephone network in East Berlin for calls from West Berlin until the two networks could be merged. In preparation for the networks, the telephone numbers assigned in East Berlin were converted to free number ranges of the West Berlin telephone network (e.g. 5 and 9). At the time of this merger, the time interval for local calls in the Berlin telephone network was introduced. Up to this point, a conversation cost 23 pfennigs regardless of its duration.

swell

↑ 0130 numbers are switched off
↑ ^a ^b ^c ^d ^e ^f ^g ^h Netnummerwijzigingen in West-Duitsland , Staatsbedrijf der PTT, Nederlands dagblad, May 30, 1975 (Dutch)
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Netnummerwijzigingen in West-Duitsland , Staatsbedrijf der PTT, Nieuwsblad van het Noorden, August 21, 1975 (Dutch)
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Official directory of local area codes (AVON), editions from 1966, 1974, 1976 and 1984 ff taken directly)
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Federal Network Agency : Changes to local area codes ( Memento from September 9, 2012 in the Internet Archive )
↑ ^a ^b ^c ^d ^e ^f Netnummerwijzigingen in West Duitsland , Staatsbedrijf der PTT, De Tijd, October 4, 1973 (Dutch)
↑ http://kg-moerlau.de/media//DIR_238801/DIR_253401/DIR_273901/1cad40127f5e1e5affff8042fffffff0.pdf
↑ Internationaal "automatically" , Nieuwsblad van het Noorden, August 2, 1958 (Dutch)
↑ ^a ^b ^c ^d ^e ^f Netnummerwijzigingen in West Duitsland , Staatsbedrijf der PTT, NRC Handelsblad, May 3, 1973 (Dutch)
↑ ^a ^b Federal Network Agency : Special stipulations in the local networks ( Memento from February 17, 2013 in the web archive archive.today ) (archive.today)
↑ ^a ^b Heise-Online report from June 29, 2003

[1] 0130 numbers are switched off

[ptt19750530-2] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Netnummerwijzigingen in West-Duitsland , Staatsbedrijf der PTT, Nederlands dagblad, May 30, 1975 (Dutch)

[ptt19750821-3] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Netnummerwijzigingen in West-Duitsland , Staatsbedrijf der PTT, Nieuwsblad van het Noorden, August 21, 1975 (Dutch)

[avon-historisch-4] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Official directory of local area codes (AVON), editions from 1966, 1974, 1976 and 1984 ff taken directly)

[bnetza-5] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Federal Network Agency : Changes to local area codes ( Memento from September 9, 2012 in the Internet Archive )

[pttnl19731005-6] ↑ ^a ^b ^c ^d ^e ^f Netnummerwijzigingen in West Duitsland , Staatsbedrijf der PTT, De Tijd, October 4, 1973 (Dutch)

[7] ttp://kg-moerlau.de/media//DIR_238801/DIR_253401/DIR_273901/1cad40127f5e1e5affff8042fffffff0.pdf

[8] Internationaal "automatically" , Nieuwsblad van het Noorden, August 2, 1958 (Dutch)

[ptt19730503-9] ↑ ^a ^b ^c ^d ^e ^f Netnummerwijzigingen in West Duitsland , Staatsbedrijf der PTT, NRC Handelsblad, May 3, 1973 (Dutch)

[bnetza2-10] Federal Network Agency : Special stipulations in the local networks ( Memento from February 17, 2013 in the web archive archive.today ) (archive.today)

[zollanschluss-11] Heise-Online report from June 29, 2003