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
2021-10-26 385-443 T-MOBILE USA, INC. 6529 SALT LAKE UT
2021-10-26 385-451 T-MOBILE USA, INC. 6529 KAYSVILLE UT
2021-10-26 442-368 T-MOBILE USA, INC. 6529 VICTORVL CA
2021-10-26 520-596 T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 564-216 T-MOBILE USA, INC. 6529 CENTRALIA WA
2021-10-26 575-285 T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2021-10-26 619-953 T-MOBILE USA, INC. 6529 LA JOLLA CA
2021-10-26 650-675 T-MOBILE USA, INC. 6529 PACIFICA CA
2021-10-26 669-331 T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-10-26 725-265 T-MOBILE USA, INC. 6529 LAS VEGAS NV
2021-10-26 970-804 T-MOBILE USA, INC. 6529 GREELEY CO
2021-10-22 216-457 T-MOBILE USA, INC. 6529 CLEVELAND OH
2021-10-22 216-460 T-MOBILE USA, INC. 6529 MONTRSE OH
2021-10-22 216-463 T-MOBILE USA, INC. 6529 CLEVELAND OH
2021-10-22 216-467 T-MOBILE USA, INC. 6529 TERRACE OH
2021-10-19 572-204 T-MOBILE USA, INC. 6529 CHANDLER OK
2021-10-18 681-410 T-MOBILE USA, INC. 6529 HNTNGTNZN2 WV
2021-10-15 480-810 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-15 715-991 T-MOBILE USA, INC. 6529 STEVENS PT WI
2021-10-13 562-578 T-MOBILE USA, INC. 6529 ALAMITOS CA
2021-10-13 564-232 T-MOBILE USA, INC. 6529 BREMERTON WA
2021-10-13 708-901 T-MOBILE USA, INC. 6529 LA GRANGE IL
2021-10-13 708-920 T-MOBILE USA, INC. 6529 CHICAGOHTS IL
2021-10-11 224-431 T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-10-11 501-489 T-MOBILE USA, INC. 6529 MALVERN AR
2021-10-11 872-293 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-11 872-294 T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2021-10-04 424-469 T-MOBILE USA, INC. 6529 CMTN GRDN CA
2021-10-04 425-340 T-MOBILE USA, INC. 6529 ISSAQUAH WA
2021-10-01 928-450 T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2021-09-29 515-567 T-MOBILE USA, INC. 6529 AMES IA
2021-09-29 872-291 T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 872-292 T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-27 206-756 T-MOBILE USA, INC. 6529 SEATTLE WA
2021-09-27 657-523 T-MOBILE USA, INC. 6529 GARDEN GRV CA
2021-09-22 224-418 T-MOBILE USA, INC. 6529 ELK GROVE IL
2021-09-22 425-469 T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-09-22 619-967 T-MOBILE USA, INC. 6529 NATIONALCY CA
2021-09-22 747-316 T-MOBILE USA, INC. 6529 BRBN BRBN CA
2021-09-22 951-627 T-MOBILE USA, INC. 6529 PERRIS CA
2021-09-20 254-450 T-MOBILE USA, INC. 6529 MARLIN TX
2021-09-20 707-913 T-MOBILE USA, INC. 6529 NAPA CA
2021-09-17 442-655 T-MOBILE USA, INC. 6529 SAN MARCOS CA
2021-09-17 562-571 T-MOBILE USA, INC. 6529 DOWNEY CA
2021-09-17 925-897 T-MOBILE USA, INC. 6529 DUBLN-SNRM CA
2021-09-16 262-294 T-MOBILE USA, INC. 6529 LAKEGENEVA WI
2021-09-16 725-260 T-MOBILE USA, INC. 6529 LAS VEGAS NV
2021-09-14 623-275 T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-13 213-597 T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2021-09-13 619-951 T-MOBILE USA, INC. 6529 LA MESA 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.