NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/18/2026
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, all time
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Sep 2026
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| Assigned | Block | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2018-01-26 | 424-419-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2018-01-12 | 424-559-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | W ANGELES | CA |
| 2018-01-04 | 949-317-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SADLBK VLY | CA |
| 2017-12-27 | 925-499-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CONCORD | CA |
| 2017-12-12 | 916-309-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2017-12-12 | 916-309-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2017-11-01 | 442-270-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL CENTRO | CA |
| 2017-10-30 | 424-410-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN MRVS | CA |
| 2017-09-25 | 424-310-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HAWTHORNE | CA |
| 2017-09-12 | 650-379-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SSNFRNCSCO | CA |
| 2017-08-21 | 530-961-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | CHICO | CA |
| 2017-08-02 | 916-926-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2017-08-02 | 951-466-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | TEMECULA | CA |
| 2017-07-26 | 323-446-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 05 | CA |
| 2017-07-26 | 831-453-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CASTROVL | CA |
| 2017-07-21 | 209-446-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MERCED | CA |
| 2017-07-10 | 213-218-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-07-07 | 213-310-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-07-07 | 213-310-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-06-16 | 628-218-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2017-06-16 | 628-218-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2017-06-16 | 628-218-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2017-06-16 | 909-407-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CLAREMONT | CA |
| 2017-06-14 | 707-757-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SANTA ROSA | CA |
| 2017-06-14 | 925-377-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MORAGA | CA |
| 2017-06-12 | 669-544-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS NORTH | CA |
| 2017-06-12 | 669-544-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS NORTH | CA |
| 2017-06-12 | 669-544-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS NORTH | CA |
| 2017-05-25 | 669-544-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS NORTH | CA |
| 2017-05-25 | 669-544-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS NORTH | CA |
| 2017-05-24 | 949-538-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CAPITRNVLY | CA |
| 2017-05-05 | 925-232-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | PSBG WEST | CA |
| 2017-04-26 | 916-250-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SO PLACER | CA |
| 2017-04-25 | 925-690-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CLAYTON | CA |
| 2017-04-19 | 209-314-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | GALT | CA |
| 2017-04-07 | 925-854-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DANVILLE | CA |
| 2017-04-04 | 831-975-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SALINAS | CA |
| 2017-03-13 | 669-287-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS WEST | CA |
| 2017-03-06 | 925-436-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ANTIOCH | CA |
| 2017-02-21 | 949-576-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IRVINE | CA |
| 2017-02-10 | 213-428-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-10 | 213-428-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.