NumberResearchRecent thousands-block assignments
1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 773
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2002-10-04 | 773-598-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN04 | IL |
| 2002-10-04 | 773-663-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN03 | IL |
| 2002-10-04 | 773-733-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN06 | IL |
| 2002-08-26 | 773-341-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN10 | IL |
| 2002-04-30 | 773-329-4XXX | 4000–4999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN03 | IL |
| 2002-03-28 | 773-474-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN10 | IL |
| 2002-02-27 | 773-269-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2002-01-30 | 773-770-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-10-23 | 773-349-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN08 | IL |
| 2001-07-19 | 773-328-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-06-25 | 773-306-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHICGOZN08 | IL |
| 2001-06-25 | 773-306-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHICGOZN08 | IL |
| 2001-06-25 | 773-306-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHICGOZN08 | IL |
| 2001-06-25 | 773-306-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN08 | IL |
| 2001-04-19 | 773-289-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-04-19 | 773-289-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-04-19 | 773-442-8XXX | 8000–8999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2001-03-12 | 773-299-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN06 | IL |
| 2001-03-12 | 773-358-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN07 | IL |
| 2001-01-02 | 773-948-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL |
| 2001-01-02 | 773-948-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL |
| 2000-09-28 | 773-295-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN05 | IL |
| 2000-09-28 | 773-358-5XXX | 5000–5999 | Assigned | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CHICGOZN07 | IL |
| 2000-09-28 | 773-359-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN09 | IL |
| 2000-09-28 | 773-739-9XXX | 9000–9999 | Assigned | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CHICGOZN02 | IL |
| 2000-09-28 | 773-770-9XXX | 9000–9999 | Assigned | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CHICGOZN04 | IL |
| 2000-09-27 | 773-648-6XXX | 6000–6999 | Assigned | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CHICGOZN06 | IL |
| 2000-09-15 | 773-482-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN11 | IL |
| 2000-08-03 | 773-681-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN02 | IL |
| 2000-08-01 | 773-359-0XXX | 0000–0999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN09 | IL |
| 2000-07-24 | 773-967-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-28 | 773-355-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN03 | IL |
| 2000-06-28 | 773-355-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN03 | IL |
| 2000-06-22 | 773-967-1XXX | 1000–1999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-22 | 773-967-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-22 | 773-967-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-20 | 773-697-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2000-06-20 | 773-697-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2000-06-14 | 773-272-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN03 | IL |
| 2000-05-24 | 773-557-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2000-05-24 | 773-648-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2000-05-19 | 773-359-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-05-19 | 773-967-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-05-19 | 773-967-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-04-07 | 773-336-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN09 | IL |
| 2000-04-07 | 773-442-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2000-04-07 | 773-442-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2000-04-07 | 773-442-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2000-03-30 | 773-948-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN08 | IL |
| 2000-01-19 | 773-822-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN06 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.