NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026
Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.
Most active assignees, all time
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2017-03-14 | 480-534 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2017-03-13 | 405-931 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK | 7258 | MIDWEST CY | OK |
| 2017-03-13 | 669-287 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNJS WEST | CA |
| 2017-03-13 | 762-337 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | WRENS | GA |
| 2017-03-09 | 470-633 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA | GA |
| 2017-03-08 | 816-708 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | KANSASCITY | MO |
| 2017-03-01 | 267-748 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHLDLPHZN3 | PA |
| 2017-02-27 | 531-393 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OMAHA | NE |
| 2017-02-17 | 949-576 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IRVINE | CA |
| 2017-02-10 | 213-428 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-02-07 | 682-247 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ARLINGTON | TX |
| 2017-02-06 | 469-536 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FRISCO | TX |
| 2017-02-06 | 931-283 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WINCHESTER | TN |
| 2017-02-03 | 628-895 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNFC CNTRL | CA |
| 2017-01-19 | 213-410 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2017-01-17 | 646-971 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2017-01-10 | 901-802 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLLIERVL | TN |
| 2016-12-29 | 774-394 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | E DOUGLAS | MA |
| 2016-12-28 | 484-659 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | READING | PA |
| 2016-12-22 | 614-964 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | WESTERVL | OH |
| 2016-12-15 | 620-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - KS | 7593 | MEADE | KS |
| 2016-12-14 | 325-309 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ALBANY | TX |
| 2016-12-09 | 774-712 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ROCHESTER | MA |
| 2016-12-09 | 774-713 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WESTPORT | MA |
| 2016-12-09 | 774-717 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHILMARK | MA |
| 2016-11-28 | 325-308 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | OZONA | TX |
| 2016-11-23 | 720-462 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2016-11-16 | 717-550 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | MECHANCSBG | PA |
| 2016-11-11 | 225-605 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA | 8764 | CLINTON | LA |
| 2016-11-08 | 469-974 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX |
| 2016-11-03 | 269-243 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | BATTLE CRK | MI |
| 2016-10-31 | 314-519 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2016-10-31 | 480-508 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2016-10-27 | 571-767 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ENGLESIDE | VA |
| 2016-10-27 | 737-248 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | KYLE | TX |
| 2016-10-10 | 602-782 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2016-10-05 | 539-204 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK | 7258 | BRISTOW | OK |
| 2016-09-30 | 224-278 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ROSELLE | IL |
| 2016-09-22 | 978-643 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BARRE | MA |
| 2016-09-02 | 669-282 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CAMPBELL | CA |
| 2016-08-29 | 720-676 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2016-08-25 | 951-494 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IDYLLWILD | CA |
| 2016-08-23 | 608-460 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SAUK CITY | WI |
| 2016-08-17 | 336-502 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | HAYS | NC |
| 2016-08-15 | 929-398 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN10 | NY |
| 2016-08-12 | 470-351 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA | GA |
| 2016-08-10 | 812-984 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | GALENA | IN |
| 2016-08-04 | 469-451 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEWISVILLE | TX |
| 2016-08-03 | 208-813 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ID | 678B | BOISE | ID |
| 2016-08-02 | 315-936 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | MEXICO | NY |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.