NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
2012-10-23 857-313 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2012-10-22 267-457 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G PHLDLPHZN1 PA
2012-10-22 412-694 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G PTTSBGZON1 PA
2012-10-22 512-937 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2012-10-22 520-484 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G TUCSON AZ
2012-10-22 570-892 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 SCRANTON PA
2012-10-22 570-904 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 SCRANTON PA
2012-10-22 585-445 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G ROCHESTER NY
2012-10-22 616-323 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C GRAND RPDS MI
2012-10-22 631-526 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC- NY 384C BABYLON NY
2012-10-22 989-355 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C SAGINAW MI
2012-10-19 224-316 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NORTHBROOK IL
2012-10-19 312-614 0–9 XXXall 10 · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2012-10-19 313-603 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2012-10-19 336-893 0–9 XXXall 10 · 4 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 WINSTN SAL NC
2012-10-19 414-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN4 WI
2012-10-19 424-284 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C BEVERLYHLS CA
2012-10-19 579-279 not yet reported which blocks → Fibernetics Corporation 464D Ste-Rose —
2012-10-19 579-379 not yet reported which blocks → Fibernetics Corporation 464D Laval-Ouest —
2012-10-19 579-578 not yet reported which blocks → Fibernetics Corporation 464D St-Vincent-de-Paul —
2012-10-19 579-679 not yet reported which blocks → Fibernetics Corporation 464D Chomedey —
2012-10-19 579-779 not yet reported which blocks → Fibernetics Corporation 464D Pont-Viau —
2012-10-19 579-979 not yet reported which blocks → Fibernetics Corporation 464D Laval-Est —
2012-10-19 581-820 not yet reported which blocks → TELUS Quebec 2243 Lac-Etchemin —
2012-10-19 602-736 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-10-19 706-780 0–9 XXXall 10 · 9 holders which blocks → METROPCS, INC. 5562 COLUMBUS GA
2012-10-19 706-981 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF GEORGIA, LLC - GA 909E GREENVILLE GA
2012-10-19 708-603 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 LA GRANGE IL
2012-10-19 754-217 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 HOLLYWOOD FL
2012-10-19 804-793 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G RICHMOND VA
2012-10-19 819-262 not yet reported which blocks → TELUS Quebec 2243 Nicolet —
2012-10-19 832-802 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ALVIN TX
2012-10-19 862-300 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G NEWARK NJ
2012-10-18 210-571 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2012-10-18 352-440 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 OLD TOWN FL
2012-10-18 352-559 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G GAINESVL FL
2012-10-18 386-301 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G DAYTONABCH FL
2012-10-18 401-442 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PROVIDENCE RI
2012-10-18 407-502 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G ORLANDO FL
2012-10-18 407-633 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C ORLANDO FL
2012-10-18 414-400 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN1 WI
2012-10-18 425-435 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2012-10-18 516-595 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K NASSAUZN08 NY
2012-10-18 561-260 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 WPALMBEACH FL
2012-10-18 581-294 not yet reported which blocks → Telecommunications Xittel Inc 247F Clarke City —
2012-10-18 581-295 not yet reported which blocks → Telecommunications Xittel Inc 247F Chevery —
2012-10-18 581-296 not yet reported which blocks → Telecommunications Xittel Inc 247F Bonne-Esperance —
2012-10-18 581-297 not yet reported which blocks → Telecommunications Xittel Inc 247F Blanc-Sablon —
2012-10-18 581-298 not yet reported which blocks → Telecommunications Xittel Inc 247F Baie-Johan-Beetz —
2012-10-18 581-299 not yet reported which blocks → Telecommunications Xittel Inc 247F Aguanish —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.