Number holder
Illinois Bell Tel
NANPA assigned Illinois Bell Tel 1,909 of the 197,646 central office codes in service, <1% of the total. Rank 19 of 36 listed holders.
What kind of holder this is
Landline telephone company. AT&T's consumer service terms name Illinois Bell Telephone Company among the AT&T companies that provide AT&T Phone Service, a wireline home phone service. Source page, read 2026-10-19.
Prefixes held
Prefixes held
1,909
of 197,646 in service (<1%)
States and territories
2
Area codes
14
Pooled prefixes
712
37% of its prefixes
Registered as Illinois Bell Tel CO, under 1 operating company number.
Prefixes by state or territory
| State or territory | Prefixes |
|---|---|
| IL | 1,908 |
| WI | 1 |
Prefixes by area code
Read this before you rely on it
The holder is the company NANPA assigned the codes to, under the legal name it registered. That name can differ from the brand customers see, and one brand can hold codes under several legal names.
Numbers port. A number in one of these prefixes may now be with another carrier, so the prefix alone does not say who serves it today. To see the holder of the block behind a number, use the carrier lookup.
Source: NANPA central office code report dated 2026-10-17 and thousands-block report dated 2026-10-17.