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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Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2020-06-02 | 763-332 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TWINCITIES | MN |
| 2020-05-19 | 202-451 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2020-03-24 | 725-230 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2020-03-24 | 980-433 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | CHARLOTTE | NC |
| 2020-03-13 | 804-546 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | RICHMOND | VA |
| 2020-02-26 | 864-566 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | GREENVILLE | SC |
| 2020-02-25 | 480-613 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2020-02-19 | 217-798 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MATTOON | IL |
| 2020-02-19 | 779-270 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DE KALB | IL |
| 2020-02-10 | 223-231 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HARISBGZN1 | PA |
| 2020-02-10 | 272-237 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BLOOMSBURG | PA |
| 2020-02-10 | 309-561 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PEORIA | IL |
| 2020-02-10 | 779-269 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ROCKFORD | IL |
| 2020-02-04 | 862-349 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PASSAIC | NJ |
| 2020-01-27 | 469-784 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DLFTWTARPT | TX |
| 2020-01-27 | 667-276 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BEL AIR | MD |
| 2020-01-13 | 314-883 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2020-01-06 | 857-353 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOSTON | MA |
| 2019-12-30 | 240-710 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | FREDERICK | MD |
| 2019-12-24 | 804-542 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | MANAKIN | VA |
| 2019-12-23 | 469-838 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX |
| 2019-12-12 | 309-459 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BLOOMINGTN | IL |
| 2019-12-05 | 913-374 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - KS | 7593 | KANSASCITY | KS |
| 2019-12-02 | 385-316 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FARMINGTON | UT |
| 2019-12-02 | 657-413 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CYPRESS | CA |
| 2019-11-27 | 951-516 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SUN CITY | CA |
| 2019-11-26 | 682-322 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MANSFIELD | TX |
| 2019-11-19 | 207-640 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ME | 7777 | LISBON FLS | ME |
| 2019-11-11 | 951-508 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CORONA | CA |
| 2019-11-07 | 910-656 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | FAYETTEVL | NC |
| 2019-11-06 | 509-409 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | QUINCY | WA |
| 2019-11-06 | 571-537 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2019-11-06 | 571-539 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2019-11-05 | 509-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | QUINCY | WA |
| 2019-10-07 | 719-516 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLORDOSPG | CO |
| 2019-09-30 | 346-398 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2019-09-03 | 636-637 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | FSSCRSTLCY | MO |
| 2019-08-27 | 571-454 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MANASSAS | VA |
| 2019-08-23 | 480-573 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2019-08-14 | 332-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2019-08-12 | 469-788 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | IRVING | TX |
| 2019-08-07 | 224-314 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ARLIGTNHTS | IL |
| 2019-08-06 | 202-923 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2019-07-24 | 314-668 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2019-07-11 | 202-921 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2019-07-10 | 276-468 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RICHLANDS | VA |
| 2019-07-10 | 540-792 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CULPEPER | VA |
| 2019-07-09 | 571-487 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ARCOLA | VA |
| 2019-06-27 | 479-362 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-05-20 | 240-677 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN5 | MD |
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.