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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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2009-03-25 | 916-692 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SCRM NORTH | CA |
| 2009-03-17 | 480-320 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2009-03-17 | 520-284 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2009-02-26 | 951-268 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CORONA | CA |
| 2009-02-25 | 240-341 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BUCKEYSTN | MD |
| 2009-02-25 | 862-243 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOPATCONG | NJ |
| 2009-02-25 | 862-259 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SUCCASUNNA | NJ |
| 2009-02-09 | 631-533 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | CENTRAISLP | NY |
| 2008-12-17 | 270-741 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WHITESVL | KY |
| 2008-12-17 | 540-277 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BERRYVILLE | VA |
| 2008-12-17 | 540-326 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MIDDLEBURG | VA |
| 2008-12-17 | 540-402 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | REMINGTON | VA |
| 2008-12-17 | 702-560 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2008-12-17 | 757-447 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | NRFOLKZON1 | VA |
| 2008-12-16 | 818-478 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BRBN BRBN | CA |
| 2008-12-04 | 702-479 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAS VEGAS | NV |
| 2008-12-03 | 540-235 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PEARISBURG | VA |
| 2008-12-01 | 540-329 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GLASGOW | VA |
| 2008-11-24 | 714-202 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ORANGE | CA |
| 2008-11-18 | 503-575 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PORTLAND | OR |
| 2008-11-17 | 720-389 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2008-11-13 | 919-695 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | DURHAM | NC |
| 2008-11-06 | 312-594 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-06 | 424-248 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2008-11-06 | 845-442 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | DOVER PL | NY |
| 2008-10-17 | 224-351 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HALF DAY | IL |
| 2008-10-08 | 203-995 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-08 | 801-839 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SALT LAKE | UT |
| 2008-10-06 | 732-908 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TOMS RIVER | NJ |
| 2008-09-26 | 424-245 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEVERLYHLS | CA |
| 2008-09-17 | 254-284 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | ROGERS | TX |
| 2008-09-17 | 254-293 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | SALADO | TX |
| 2008-09-17 | 254-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | LITTLE RIV | TX |
| 2008-08-27 | 480-371 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2008-08-23 | 331-462 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | LOMBARD | IL |
| 2008-08-20 | 203-897 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-15 | 201-743 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | JERSEYCITY | NJ |
| 2008-08-13 | 919-576 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | RALEIGH | NC |
| 2008-08-13 | 919-714 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | RALEIGH | NC |
| 2008-08-12 | 518-649 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | ALBANY | NY |
| 2008-08-12 | 607-873 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | ELMIRA | NY |
| 2008-07-24 | 845-481 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | KINGSTON | NY |
| 2008-07-18 | 570-308 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | MUNCY | PA |
| 2008-07-11 | 623-201 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2008-06-06 | 702-583 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2008-06-05 | 682-233 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORT WORTH | TX |
| 2008-06-03 | 314-925 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2008-05-29 | 480-347 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2008-05-29 | 571-266 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2008-05-27 | 202-469 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
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.