NewLocalNumbers.com
OCN 9323 · Regional Bell Operating Company

Ameritech Michigan

d/b/a AT&T Michigan

Holding: AT&T Inc

Total blocks
5,035
Recent (18 mo)
0
Medium
0
Old
312
Area codes
11
States
1
Address
2000 W Att Center Dr, Room 4G33A
Hoffman Estates, IL 60192-5005
Website
AT&T Michigan
First assigned block
2001-01-15
Last assigned block
2019-10-31
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HQ — Hoffman Estates, IL

Street view of Ameritech Michigan HQ
Street view
Satellite view of Ameritech Michigan HQ
Satellite

Block portfolio at a glance

By age

Old: 312Undated: 4,7235,035blocks
  • Recent (0) — last 18 mo
  • Medium (0)
  • Old (312)
  • Undated (4,723)

Footprint by state

Stronger blue = more blocks issued in that state. ● marks states with activity in the last 18 months.

HawaiiAlaskaFloridaSouth CarolinaGeorgiaAlabamaNorth CarolinaTennesseeRhode IslandConnecticutMassachusettsMaineNew HampshireVermontNew YorkNew JerseyPennsylvaniaDelawareMarylandWest VirginiaKentuckyOhioMichigan (MI): 5,035 blocksWyomingMontanaIdahoWashingtonTexasCaliforniaArizonaNevadaUtahColoradoNew MexicoOregonNorth DakotaSouth DakotaNebraskaIowaMississippiIndianaIllinoisMinnesotaWisconsinMissouriArkansasOklahomaKansasLouisianaVirginiaDistrict of Columbia

Top area codes

Bars show total blocks; red overlay is recent.

248863313813734657616432269383517378989319586314810306231305906265

Block assignments by year

01
02
03
32 04
05
06
41 07
43 08
09
10
11
12
13
14
15
17
19

Area codes

NPABlocksRecentLast
248 863 — 2017-08-18
313 813 — 2017-06-12
734 657 — 2019-10-31
616 432 — 2014-04-15
269 383 — 2013-07-08
517 378 — 2014-04-24
989 319 — 2010-08-03
586 314 — 2011-06-09
810 306 — 2006-06-28
231 305 — 2015-03-26
906 265 — 2001-05-14

States

StateBlocksRecent
MI 5,035 —

Sister OCNs under AT&T Inc

OCNCompanyTotalRecent
6534 New Cingular Wireless PCS LLC - IL 58,704 6,972
6214 New Cingular Wireless PCS LLC - GA 40,046 5,569
6010 New Cingular Wireless PCS LLC 38,106 3,116
4036 New Cingular Wireless PCS LLC - DC 30,944 4,493
9533 Southwestern Bell Telephone Company 26,095 0
9740 Pacific Bell Telephone Company 18,541 0
9417 Bellsouth Telecommunications Inc dba Southern Bell Telephone & Telegraph 15,734 0
9419 Bellsouth Telecommunications Inc dba South Central Bell Telephone 13,075 0
9329 Ameritech Illinois 6,645 0
516C AT&T Enterprises LLC 5,935 113
9321 Ameritech Ohio 4,377 0
9325 Ameritech Indiana 2,941 0