NumberResearch Membership · Data 09/18/2026

Recent prefix assignments

5 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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, last 30 days
T-MOBILE USA, INC. 5
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXAssigneeOCNRate centerState
2021-08-03 331-274 T-MOBILE USA, INC. 6529 AURORA IL
2021-08-03 331-275 T-MOBILE USA, INC. 6529 BARTLETT IL
2021-08-03 575-277 T-MOBILE USA, INC. 6529 LAS CRUCES NM
2021-08-03 872-287 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-07-27 575-271 T-MOBILE USA, INC. 6529 CLOVIS NM
2021-07-27 928-417 T-MOBILE USA, INC. 6529 SAFFORD AZ
2021-07-22 725-254 T-MOBILE USA, INC. 6529 LAS VEGAS NV
2021-07-20 234-304 T-MOBILE USA, INC. 6529 HUDSON OH
2021-07-20 682-355 T-MOBILE USA, INC. 6529 ARLINGTON TX
2021-07-19 520-553 T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-07-16 209-849 T-MOBILE USA, INC. 6529 MODESTO CA
2021-07-16 209-875 T-MOBILE USA, INC. 6529 MERCED CA
2021-07-16 213-564 T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-07-16 562-538 T-MOBILE USA, INC. 6529 ALAMITOS CA
2021-07-16 725-253 T-MOBILE USA, INC. 6529 MESQUITE NV
2021-07-16 820-206 T-MOBILE USA, INC. 6529 PASOROBLES CA
2021-07-14 725-252 T-MOBILE USA, INC. 6529 LAUGHLIN NV
2021-07-07 224-390 T-MOBILE USA, INC. 6529 ROUND LAKE IL
2021-07-07 234-297 T-MOBILE USA, INC. 6529 NORTH LIMA OH
2021-07-01 602-807 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-06-30 458-271 T-MOBILE USA, INC. 6529 ROSEBURG OR
2021-06-30 539-250 T-MOBILE USA, INC. 6529 BROKENARRW OK
2021-06-30 539-251 T-MOBILE USA, INC. 6529 PRYOR OK
2021-06-30 657-508 T-MOBILE USA, INC. 6529 CYPRESS CA
2021-06-30 661-519 T-MOBILE USA, INC. 6529 ARVIN CA
2021-06-29 636-252 T-MOBILE USA, INC. 6529 CHESTERFLD MO
2021-06-28 608-706 T-MOBILE USA, INC. 6529 TOMAH WI
2021-06-17 206-532 T-MOBILE USA, INC. 6529 SEATTLE WA
2021-06-17 424-449 T-MOBILE USA, INC. 6529 CMTN CMTN CA
2021-06-17 562-516 T-MOBILE USA, INC. 6529 DOWNEY CA
2021-06-17 971-398 T-MOBILE USA, INC. 6529 SALEM OR
2021-06-15 806-751 T-MOBILE USA, INC. 6529 DUMAS TX
2021-06-15 806-760 T-MOBILE USA, INC. 6529 BROWNFIELD TX
2021-06-11 213-558 T-MOBILE USA, INC. 6529 LSAN DA 12 CA
2021-06-10 726-205 T-MOBILE USA, INC. 6529 SANANTONIO TX
2021-06-10 726-206 T-MOBILE USA, INC. 6529 SANANTONIO TX
2021-06-10 779-329 T-MOBILE USA, INC. 6529 MENDOTA IL
2021-06-09 564-212 T-MOBILE USA, INC. 6529 ABERDEEN WA
2021-06-09 657-502 T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2021-06-09 715-990 T-MOBILE USA, INC. 6529 SHAWANO WI
2021-06-02 216-405 T-MOBILE USA, INC. 6529 TERRACE OH
2021-06-02 618-725 T-MOBILE USA, INC. 6529 VANDALIA IL
2021-06-02 618-737 T-MOBILE USA, INC. 6529 BELLEVILLE IL
2021-06-01 405-986 T-MOBILE USA, INC. 6529 CHANDLER OK
2021-06-01 405-989 T-MOBILE USA, INC. 6529 HOLDENVL OK
2021-05-27 458-266 T-MOBILE USA, INC. 6529 LEBANON OR
2021-05-27 480-791 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-05-27 602-815 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-05-24 208-671 T-MOBILE USA, INC. 6529 MALTA ID

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.