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Carrier group · Regional Bell Operating Company

AT&T Michigan

Holding: AT&T Inc

Total blocks
5,035
Recent (18 mo)
0
Medium
0
Old
312
Member OCNs
1
States
1
Area codes
11
First assigned block
2001-01-15
Last assigned block
2019-10-31
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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

Member OCNs

1 OCN roll up under AT&T Michigan.

OCNCompany name on fileHQTypeTotalRecent
9323 Ameritech Michigan Hoffman Estates, IL Regional Bell Operating Company 5,035 —