Phone Prefix
(312) 521-XXXX
IL • CHICGOZN01
Search Number in This Prefix
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Carrier Information
NANPA
State
IL
Region
MW
Rate Center
CHICGOZN01
Assigned To
BANDWIDTH.COM CLEC, LLC - IL
OCN
984E
Status
AS
Date Assigned
Feb 02, 2010
Number Range
First Number
(312) 521-0000
Last Number
(312) 521-9999
This prefix contains 10,000 possible phone numbers
Spam Reports
21 reports
21
Total FCC + FTC DNC complaints for numbers in this prefix
Top 20 Most Reported Numbers
| # | Phone Number | Reports |
|---|---|---|
| 1 | (312) 521-5379 3125215379 | 2 |
| 2 | (312) 521-0807 3125210807 | 1 |
| 3 | (312) 521-1009 3125211009 | 1 |
| 4 | (312) 521-1367 3125211367 | 1 |
| 5 | (312) 521-1401 3125211401 | 1 |
| 6 | (312) 521-1504 3125211504 | 1 |
| 7 | (312) 521-1907 3125211907 | 1 |
| 8 | (312) 521-2010 3125212010 | 1 |
| 9 | (312) 521-4065 3125214065 | 1 |
| 10 | (312) 521-4360 3125214360 | 1 |
| 11 | (312) 521-4521 3125214521 | 1 |
| 12 | (312) 521-4701 3125214701 | 1 |
| 13 | (312) 521-4786 3125214786 | 1 |
| 14 | (312) 521-4800 3125214800 | 1 |
| 15 | (312) 521-4901 3125214901 | 1 |
| 16 | (312) 521-5302 3125215302 | 1 |
| 17 | (312) 521-5829 3125215829 | 1 |
| 18 | (312) 521-7864 3125217864 | 1 |
| 19 | (312) 521-0216 3125210216 | 1 |
| 20 | (312) 521-9509 3125219509 | 1 |
About This Prefix
Phone numbers starting with (312) 521 are part of the North American Numbering Plan (NANP). The first three digits (312) represent the Area Code (NPA), and the next three digits (521) represent the Central Office Code (NXX) or exchange.
- NPA (312) - Numbering Plan Area, identifies the geographic region
- NXX (521) - Central Office Code, identifies the specific exchange
- XXXX - Subscriber number (0000-9999)