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 |
|---|---|---|---|---|---|
| 2017-01-20 | 209-237-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TRACY | CA |
| 2017-01-20 | 209-237-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TRACY | CA |
| 2017-01-20 | 213-410-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2016-12-15 | 669-212-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS WEST | CA |
| 2016-10-24 | 424-225-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-09-30 | 951-484-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HEMT HEMT | CA |
| 2016-09-27 | 650-484-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SAN MATEO | CA |
| 2016-09-06 | 669-282-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CAMPBELL | CA |
| 2016-08-25 | 951-494-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IDYLLWILD | CA |
| 2016-08-09 | 323-705-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 02 | CA |
| 2016-08-09 | 424-301-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-06-24 | 657-276-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ANAHEIM | CA |
| 2016-06-24 | 925-690-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CLAYTON | CA |
| 2016-06-24 | 949-538-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CAPITRNVLY | CA |
| 2016-06-01 | 424-388-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MALIBU | CA |
| 2016-05-27 | 442-286-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ESCONDIDO | CA |
| 2016-05-17 | 209-237-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TRACY | CA |
| 2016-05-11 | 747-205-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | NO HOLLYWD | CA |
| 2016-05-10 | 209-427-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TURLOCK | CA |
| 2016-05-06 | 209-457-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | IONE | CA |
| 2016-04-27 | 916-755-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | RSVL MAIN | CA |
| 2016-04-12 | 209-362-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TRACY | CA |
| 2016-04-08 | 424-301-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-03-31 | 209-838-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | ESCALON | CA |
| 2016-03-25 | 209-867-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | LOCKEFORD | CA |
| 2016-03-08 | 916-738-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2016-03-08 | 916-738-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2016-03-07 | 628-228-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2016-03-07 | 669-230-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS WEST | CA |
| 2016-03-01 | 626-349-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ALHAMBRA | CA |
| 2016-03-01 | 747-241-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BRBN BRBN | CA |
| 2016-02-29 | 424-531-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CMTN GRDN | CA |
| 2016-02-22 | 510-694-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | OKLD ALMD | CA |
| 2016-02-05 | 424-526-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN MRVS | CA |
| 2016-01-08 | 559-715-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | CHOWCHILLA | CA |
| 2016-01-05 | 669-275-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS SOUTH | CA |
| 2016-01-05 | 949-299-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IRVINE | CA |
| 2016-01-04 | 657-273-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SANTA ANA | CA |
| 2015-11-13 | 424-313-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-11-13 | 916-629-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MEADOWVIEW | CA |
| 2015-11-13 | 916-629-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MEADOWVIEW | CA |
| 2015-10-30 | 424-303-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-10-30 | 916-754-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2015-10-30 | 916-754-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2015-10-30 | 949-541-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LAGUNA BCH | CA |
| 2015-10-27 | 209-287-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MODESTO | CA |
| 2015-10-27 | 916-891-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM NORTH | CA |
| 2015-10-27 | 951-475-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CORONA | CA |
| 2015-10-22 | 669-257-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SAN MARTIN | CA |
| 2015-10-22 | 909-655-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DIAMONDBAR | 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.