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
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2013-11-25 | 530-594 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | GRIDLEY | CA |
| 2013-11-22 | 415-805 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2013-11-22 | 618-471 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | WOOD RIVER | IL |
| 2013-11-22 | 618-582 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | NEW ATHENS | IL |
| 2013-11-22 | 618-693 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | BETHALTO | IL |
| 2013-11-21 | 702-854 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2013-11-19 | 951-387 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MURRIETA | CA |
| 2013-11-12 | 260-702 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | FORT WAYNE | IN |
| 2013-11-11 | 417-556 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | JOPLIN | MO |
| 2013-11-11 | 772-365 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | VERO BEACH | FL |
| 2013-11-03 | 781-207 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WALTHAM | MA |
| 2013-11-03 | 781-623 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LYNNFIELD | MA |
| 2013-11-03 | 781-634 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NORWOOD | MA |
| 2013-11-03 | 781-723 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MEDFORD | MA |
| 2013-11-03 | 781-823 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | REVERE | MA |
| 2013-11-03 | 978-428 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AYER | MA |
| 2013-10-31 | 779-704 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | MCHENRY | IL |
| 2013-10-25 | 312-809 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2013-10-24 | 253-371 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TACOMA | WA |
| 2013-10-23 | 331-702 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | NAPERVILLE | IL |
| 2013-10-21 | 573-409 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | HERMANN | MO |
| 2013-10-08 | 646-782 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2013-10-07 | 916-661 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2013-09-13 | 561-469 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | WPALMBEACH | FL |
| 2013-09-12 | 615-905 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2013-08-29 | 615-381 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-08-26 | 971-473 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEAVERTON | OR |
| 2013-08-22 | 646-766 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2013-08-22 | 804-774 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | RICHMOND | VA |
| 2013-08-19 | 650-272 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PALO ALTO | CA |
| 2013-07-31 | 909-378 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DIAMONDBAR | CA |
| 2013-07-30 | 616-552 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | GRAND RPDS | MI |
| 2013-07-26 | 315-925 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SYRACUSE | NY |
| 2013-07-16 | 978-553 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HUDSON | MA |
| 2013-07-05 | 845-366 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | HYDE PARK | NY |
| 2013-07-02 | 252-201 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | BAYBORO | NC |
| 2013-06-20 | 484-273 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | ALLENTOWN | PA |
| 2013-05-17 | 816-908 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | KANSASCITY | MO |
| 2013-05-16 | 571-551 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2013-05-15 | 210-810 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2013-05-13 | 313-725 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | DETROITZN1 | MI |
| 2013-05-09 | 832-664 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2013-04-22 | 469-803 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FRISCO | TX |
| 2013-04-16 | 312-585 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2013-04-16 | 984-664 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | RALEIGH | NC |
| 2013-04-12 | 646-676 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2013-03-27 | 832-941 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2013-03-27 | 929-252 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2013-03-21 | 276-296 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7299 | INDEPNDNCE | VA |
| 2013-03-19 | 469-603 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX |
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.