NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2016-08-31 660-297 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 ALBANY MO
2016-08-31 720-534 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D LONGMONT CO
2016-08-31 769-231 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MADISON MS
2016-08-31 936-320 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONROE TX
2016-08-30 236-361 not yet reported which blocks → Iristel Inc. 154E Kelowna —
2016-08-30 239-320 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C SNCPVISNDS FL
2016-08-30 239-347 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C CAPE CORAL FL
2016-08-30 239-351 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C NAPLES FL
2016-08-30 239-360 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C CAPE CORAL FL
2016-08-30 314-528 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LADUE MO
2016-08-30 346-336 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K TOMBALL TX
2016-08-30 484-473 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G W CHESTER PA
2016-08-30 510-513 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FRNK MAIN CA
2016-08-30 559-371 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 FRESNO CA
2016-08-30 587-818 not yet reported which blocks → Iristel Inc. 154E Grande Prairie —
2016-08-30 626-491 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PSDN PSDN CA
2016-08-30 650-447 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 MT VIEW CA
2016-08-30 657-340 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WESTMINSTR CA
2016-08-30 669-278 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CAMPBELL CA
2016-08-30 925-436 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-08-29 226-536 not yet reported which blocks → Quadro Communications Co-operative Inc. 004G Woodstock —
2016-08-29 343-665 not yet reported which blocks → Videotron Ltd. 787G Ottawa-Hull —
2016-08-29 424-390 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 REDONDO CA
2016-08-29 614-680 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 COLUMBUS OH
2016-08-29 614-965 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 COLUMBUS OH
2016-08-29 661-416 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARVIN CA
2016-08-29 669-208 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LOS GATOS CA
2016-08-29 669-209 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SAN MARTIN CA
2016-08-29 669-210 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNJS WEST CA
2016-08-29 720-676 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2016-08-29 786-867 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MIAMI FL
2016-08-26 209-360 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2016-08-26 224-551 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEERFIELD IL
2016-08-26 314-343 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CREVECOEUR MO
2016-08-26 320-430 0XXX4XXX9XXX · 3 holders which blocks → WINDSTREAM LAKEDALE, INC. 1414 ANNANDALE MN
2016-08-26 407-820 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ORLANDO FL
2016-08-26 470-341 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 ATLANTA SO GA
2016-08-26 510-738 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRNK OLIVR CA
2016-08-26 563-230 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DYERSVILLE IA
2016-08-26 619-480 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2016-08-26 657-343 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-08-26 657-344 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-08-26 657-345 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 YORBALINDA CA
2016-08-26 702-849 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MESQUITE NV
2016-08-26 702-867 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NV 075F MTCHARLETN NV
2016-08-26 747-267 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 RESEDA CA
2016-08-26 747-274 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNFN PACM CA
2016-08-26 828-588 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NC 8389 BOONE NC
2016-08-26 909-588 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MENTONE CA
2016-08-26 934-223 0–9 XXXall 10 · 6 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 SMITHTOWN NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.