NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 — NPA 424
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-05-05 | 424-544-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EL SEGUNDO | CA |
| 2022-03-02 | 424-544-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EL SEGUNDO | CA |
| 2021-09-30 | 424-457-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEVERLYHLS | CA |
| 2021-09-30 | 424-457-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEVERLYHLS | CA |
| 2021-09-29 | 424-899-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2021-09-29 | 424-899-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2021-09-29 | 424-899-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2020-06-10 | 424-415-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CMTN GRDN | CA |
| 2020-04-21 | 424-512-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEVERLYHLS | CA |
| 2020-02-27 | 424-409-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | REDONDO | CA |
| 2020-02-27 | 424-428-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNMN MRVS | CA |
| 2020-02-27 | 424-440-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2020-02-25 | 424-439-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | INGLEWOOD | CA |
| 2020-02-25 | 424-499-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EL SEGUNDO | CA |
| 2019-07-02 | 424-429-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CMTN CMTN | CA |
| 2019-05-31 | 424-365-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | W ANGELES | CA |
| 2019-05-22 | 424-429-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CMTN CMTN | CA |
| 2019-02-19 | 424-416-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN SNMN | CA |
| 2018-12-26 | 424-413-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN SNMN | CA |
| 2018-11-30 | 424-323-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | TORRANCE | CA |
| 2018-11-06 | 424-417-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SAN PEDRO | CA |
| 2018-10-30 | 424-426-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HAWTHORNE | CA |
| 2018-10-19 | 424-408-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | REDONDO | CA |
| 2018-10-08 | 424-307-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HAWTHORNE | CA |
| 2018-01-26 | 424-419-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2018-01-12 | 424-559-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | W ANGELES | CA |
| 2017-11-03 | 424-405-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EL SEGUNDO | CA |
| 2017-10-30 | 424-410-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN MRVS | CA |
| 2017-09-25 | 424-310-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HAWTHORNE | CA |
| 2016-10-24 | 424-225-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-08-09 | 424-301-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-06-01 | 424-388-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MALIBU | CA |
| 2016-04-08 | 424-301-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2016-02-29 | 424-531-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CMTN GRDN | CA |
| 2016-02-05 | 424-526-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN MRVS | CA |
| 2015-11-13 | 424-313-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-10-30 | 424-303-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-10-14 | 424-360-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | TORRANCE | CA |
| 2015-10-05 | 424-535-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | W ANGELES | CA |
| 2015-04-10 | 424-359-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-04-07 | 424-393-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2015-02-12 | 424-301-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2014-10-03 | 424-361-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CULVERCITY | CA |
| 2014-06-24 | 424-610-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNMN SNMN | CA |
| 2014-04-11 | 424-347-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LOMITA | CA |
| 2014-02-13 | 424-299-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNMN SNMN | CA |
| 2014-02-04 | 424-334-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | AVALON | CA |
| 2014-02-03 | 424-332-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2013-11-15 | 424-296-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CMTN CMTN | CA |
| 2012-09-18 | 424-252-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNMN SNMN | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.