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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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2015-12-21 | 779-231 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | JOLIET | IL |
| 2015-12-16 | 267-533 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHLDLPHZN1 | PA |
| 2015-12-16 | 667-313 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | PIKESVILLE | MD |
| 2015-12-11 | 480-401 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-12-07 | 614-549 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | COLUMBUS | OH |
| 2015-11-24 | 737-843 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | LEANDER | TX |
| 2015-11-13 | 424-313 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-11-12 | 518-840 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | WARRENSBG | NY |
| 2015-11-12 | 602-833 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-10-30 | 916-754 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2015-10-30 | 949-541 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LAGUNA BCH | CA |
| 2015-10-28 | 910-748 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | FAYETTEVL | NC |
| 2015-10-28 | 940-307 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENTON | TX |
| 2015-10-19 | 531-329 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OMAHA | NE |
| 2015-10-15 | 213-279 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2015-10-06 | 901-712 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MEMPHIS | TN |
| 2015-10-05 | 614-490 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | REYNOLDSBG | OH |
| 2015-09-30 | 206-539 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2015-09-28 | 623-745 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-09-25 | 206-492 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2015-09-22 | 737-203 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | AUSTIN | TX |
| 2015-09-21 | 480-665 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-09-17 | 571-472 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN17 | VA |
| 2015-09-11 | 646-677 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN01 | NY |
| 2015-08-26 | 561-618 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | WPALMBEACH | FL |
| 2015-08-25 | 949-538 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CAPITRNVLY | CA |
| 2015-08-21 | 469-486 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FRISCO | TX |
| 2015-08-19 | 346-307 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | KATY | TX |
| 2015-08-19 | 929-397 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2015-08-18 | 240-781 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD |
| 2015-08-12 | 786-812 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL |
| 2015-08-11 | 614-698 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | DUBLIN | OH |
| 2015-08-11 | 717-874 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | LANCASTER | PA |
| 2015-08-11 | 878-208 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CRIDERSCOR | PA |
| 2015-08-05 | 470-447 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA | GA |
| 2015-07-29 | 206-668 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2015-07-21 | 629-202 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2015-07-07 | 737-484 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | AUSTIN | TX |
| 2015-07-06 | 458-505 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SHADY COVE | OR |
| 2015-06-29 | 786-491 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL |
| 2015-06-26 | 312-471 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-06-19 | 213-334 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | LSAN DA 01 | CA |
| 2015-06-15 | 623-499 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-06-12 | 240-562 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAITHERSBG | MD |
| 2015-06-12 | 702-984 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2015-06-04 | 830-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWBRANFLS | TX |
| 2015-06-01 | 210-350 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2015-05-21 | 603-931 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2015-05-18 | 253-844 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TACOMA | WA |
| 2015-05-14 | 949-432 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | NEWPORTBCH | CA |
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.