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
2017-04-05 331-236 T-MOBILE USA, INC. 6529 WHEATON IL
2017-04-04 779-238 T-MOBILE USA, INC. 6529 ROCKFORD IL
2017-03-31 708-722 T-MOBILE USA, INC. 6529 CHICAGOHTS IL
2017-03-29 442-218 T-MOBILE USA, INC. 6529 LKISABELLA CA
2017-03-29 737-217 T-MOBILE USA, INC. 6529 AUSTIN TX
2017-03-24 406-916 T-MOBILE USA, INC. 6529 HELENA MT
2017-03-24 669-216 T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2017-03-23 559-701 T-MOBILE USA, INC. 6529 CLOVIS CA
2017-03-23 619-530 T-MOBILE USA, INC. 6529 SNDG SNDG CA
2017-03-23 925-503 T-MOBILE USA, INC. 6529 ANTIOCH CA
2017-03-22 385-394 T-MOBILE USA, INC. 6529 KAYSVILLE UT
2017-03-20 224-322 T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2017-03-20 224-529 T-MOBILE USA, INC. 6529 GLENVIEW IL
2017-03-20 331-226 T-MOBILE USA, INC. 6529 NAPERVILLE IL
2017-03-15 214-940 T-MOBILE USA, INC. 6529 FRISCO TX
2017-03-14 458-209 T-MOBILE USA, INC. 6529 EUGENE OR
2017-03-13 206-751 T-MOBILE USA, INC. 6529 SEATTLE WA
2017-03-13 909-768 T-MOBILE USA, INC. 6529 CALIMESA CA
2017-03-13 971-287 T-MOBILE USA, INC. 6529 MCMINNVL OR
2017-03-10 669-286 T-MOBILE USA, INC. 6529 MORGANHILL CA
2017-03-06 501-293 T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2017-02-21 360-644 T-MOBILE USA, INC. 6529 LONGVIEW WA
2017-02-21 669-281 T-MOBILE USA, INC. 6529 SNJS WEST CA
2017-02-17 209-318 T-MOBILE USA, INC. 6529 OAKDALE CA
2017-02-14 559-293 T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-02 580-967 T-MOBILE USA, INC. 6529 ADA OK
2017-01-19 562-378 T-MOBILE USA, INC. 6529 WHITTIER CA
2017-01-17 909-761 T-MOBILE USA, INC. 6529 S BERNDINO CA
2017-01-16 310-554 T-MOBILE USA, INC. 6529 CMTN CMTN CA
2017-01-16 661-403 T-MOBILE USA, INC. 6529 PLDL PLDL CA
2017-01-13 626-503 T-MOBILE USA, INC. 6529 ALHAMBRA CA
2016-12-29 915-263 T-MOBILE USA, INC. 6529 EL PASO TX
2016-12-27 747-291 T-MOBILE USA, INC. 6529 BRBN BRBN CA
2016-12-13 442-216 T-MOBILE USA, INC. 6529 VISTA CA
2016-12-13 708-840 T-MOBILE USA, INC. 6529 TINLEYPARK IL
2016-12-12 224-605 T-MOBILE USA, INC. 6529 ELGIN IL
2016-12-12 224-607 T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-12 682-386 T-MOBILE USA, INC. 6529 ARLINGTON TX
2016-12-08 720-592 T-MOBILE USA, INC. 6529 DENVER CO
2016-12-07 970-816 T-MOBILE USA, INC. 6529 CORTEZ CO
2016-12-01 559-290 T-MOBILE USA, INC. 6529 FRESNO CA
2016-12-01 619-830 T-MOBILE USA, INC. 6529 CHULAVISTA CA
2016-12-01 628-213 T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2016-12-01 951-441 T-MOBILE USA, INC. 6529 ARLINGTON CA
2016-11-30 385-266 T-MOBILE USA, INC. 6529 SALT LAKE UT
2016-11-30 425-382 T-MOBILE USA, INC. 6529 EVERETT WA
2016-11-29 619-514 T-MOBILE USA, INC. 6529 SNDG SNDG CA
2016-11-28 209-621 T-MOBILE USA, INC. 6529 HUGHSON CA
2016-11-23 505-347 T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2016-11-23 970-844 T-MOBILE USA, INC. 6529 DURANGO CO

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.