NumberResearchRecent thousands-block assignments
1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 312
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-05-19 | 312-778-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | CHICGOZN01 | IL |
| 2015-05-19 | 312-778-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHICGOZN01 | IL |
| 2015-05-19 | 312-897-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | CHICGOZN01 | IL |
| 2015-05-19 | 312-897-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | CHICGOZN01 | IL |
| 2015-05-19 | 312-897-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | CHICGOZN01 | IL |
| 2015-05-19 | 312-937-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-937-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-19 | 312-975-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2015-05-11 | 312-778-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-11 | 312-778-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-11 | 312-778-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-11 | 312-778-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-06 | 312-897-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-06 | 312-897-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-05-06 | 312-897-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-04-27 | 312-897-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-20 | 312-767-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-04-14 | 312-248-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-03-25 | 312-638-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ILLINOIS, LLC - IL | 138G | CHICGOZN01 | IL |
| 2015-03-24 | 312-897-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-03-24 | 312-897-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-03-24 | 312-897-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-03-23 | 312-248-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-03-23 | 312-248-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2015-03-18 | 312-248-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHICGOZN01 | IL |
| 2015-02-25 | 312-517-9XXX | 9000–9999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHICGOZN01 | IL |
| 2015-02-25 | 312-934-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHICGOZN01 | IL |
| 2015-02-18 | 312-517-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2015-02-18 | 312-517-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2015-02-17 | 312-517-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-02-17 | 312-517-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2015-02-10 | 312-517-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-02-10 | 312-517-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-02-10 | 312-690-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2015-02-03 | 312-966-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF ILLINOIS, LLC - IL | 138G | CHICGOZN01 | IL |
| 2015-01-08 | 312-669-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.