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 |
|---|---|---|---|---|---|
| 2021-10-01 | 949-806 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CAPITRNVLY | CA |
| 2021-09-29 | 707-918 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANTA ROSA | CA |
| 2021-09-28 | 253-374 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AUBURN | WA |
| 2021-08-11 | 332-253 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2021-08-11 | 480-796 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2021-08-10 | 564-205 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BREMERTON | WA |
| 2021-07-28 | 667-343 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | CAMBRIDGE | MD |
| 2021-07-19 | 470-857 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA NE | GA |
| 2021-07-07 | 559-220 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEMOORE | CA |
| 2021-07-06 | 949-671 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | IRVINE | CA |
| 2021-05-12 | 808-496 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HONOLULU | HI |
| 2021-05-10 | 808-869 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HONOLULU | HI |
| 2021-04-26 | 234-293 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | TWINSBURG | OH |
| 2021-04-26 | 440-697 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | HILLCREST | OH |
| 2021-04-22 | 540-803 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | STAFFORD | VA |
| 2021-04-07 | 984-281 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | DURHAM | NC |
| 2021-03-10 | 209-706 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LINDEN | CA |
| 2021-03-04 | 207-410 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ME | 7777 | EMILLINCKT | ME |
| 2021-03-04 | 352-791 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOWEYINHLS | FL |
| 2021-02-02 | 929-572 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2021-01-15 | 571-644 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ENGLESIDE | VA |
| 2021-01-13 | 571-588 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ENGLESIDE | VA |
| 2020-12-14 | 774-448 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILFORD | MA |
| 2020-11-24 | 470-713 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA SO | GA |
| 2020-11-06 | 901-582 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MEMPHIS | TN |
| 2020-10-23 | 725-240 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAS VEGAS | NV |
| 2020-10-21 | 208-563 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOISE | ID |
| 2020-10-19 | 669-303 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNJS SOUTH | CA |
| 2020-10-15 | 414-285 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILWAUKZN1 | WI |
| 2020-10-15 | 608-621 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MADISON | WI |
| 2020-10-15 | 715-956 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EAU CLAIRE | WI |
| 2020-10-15 | 920-512 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | APPLETON | WI |
| 2020-09-22 | 667-296 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | REISTERSTN | MD |
| 2020-09-17 | 412-813 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ELIZABETH | PA |
| 2020-09-16 | 509-403 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | QUINCY | WA |
| 2020-09-08 | 470-650 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA | GA |
| 2020-09-02 | 316-370 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WICHITA | KS |
| 2020-09-02 | 564-201 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OLYMPIA | WA |
| 2020-09-02 | 785-471 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TOPEKA | KS |
| 2020-08-13 | 332-236 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2020-08-06 | 913-389 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KANSASCITY | KS |
| 2020-07-30 | 816-648 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KANSASCITY | MO |
| 2020-07-27 | 636-335 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | FENTON | MO |
| 2020-07-02 | 989-346 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | MIO | MI |
| 2020-06-30 | 314-847 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | LADUE | MO |
| 2020-06-29 | 202-428 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2020-06-24 | 445-223 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHLDLPHZN1 | PA |
| 2020-06-24 | 929-552 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2020-06-24 | 929-553 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN09 | NY |
| 2020-06-12 | 616-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | COOPERSVL | MI |
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.