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
2018-08-09 873-532 not yet reported which blocks → TELUS Quebec 2243 Kingsey-Falls —
2018-08-09 920-413 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 DE PERE WI
2018-08-09 928-281 0XXX1XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SELIGMAN AZ
2018-08-09 928-290 0XXX1XXX2XXX3XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BAGDAD AZ
2018-08-08 226-552 not yet reported which blocks → Videotron Ltd. 383F Brantford —
2018-08-08 332-205 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2018-08-08 430-244 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JACKSONVL TX
2018-08-08 650-420 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PACIFICA CA
2018-08-08 843-985 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 CHARLESTON SC
2018-08-07 407-684 0–9 XXXall 10 · 3 holders which blocks → AIRESPRING, INC. 996H ORLANDO FL
2018-08-07 901-431 0–9 XXXall 10 · 3 holders which blocks → AIRESPRING, INC. 996H MEMPHIS TN
2018-08-06 458-235 0XXX2XXX4XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 BOARDMAN OR
2018-08-06 458-236 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 RUFUS OR
2018-08-06 740-748 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FREDERCKTN OH
2018-08-06 909-513 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARROWHEAD CA
2018-08-06 917-985 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2018-08-06 920-441 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K APPLETON WI
2018-08-06 971-335 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CLACKAMAS OR
2018-08-03 562-390 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DOWNEY CA
2018-08-03 862-327 0–9 XXXall 10 · 4 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J NEWARK NJ
2018-08-02 240-642 0–9 XXXall 10 · 5 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J WSNGTNZN10 MD
2018-08-02 249-750 not yet reported which blocks → Northern Telephone Ltd. 8228 Timmins —
2018-08-02 365-230 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Brampton —
2018-08-02 365-231 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Brampton —
2018-08-02 513-547 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TRENTON OH
2018-08-02 513-548 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MASON OH
2018-08-02 581-419 not yet reported which blocks → Videotron Ltd. 8306 Donnacona —
2018-08-02 587-374 not yet reported which blocks → Iristel Inc. 154E Fort McMurray —
2018-08-02 774-374 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARLBORO MA
2018-08-02 828-818 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BLOWING RK NC
2018-08-02 873-630 not yet reported which blocks → Telebec Ltee. 8239 Val-D'Or —
2018-08-02 971-332 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
2018-08-01 309-332 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D STANFORD IL
2018-08-01 618-668 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC 224C GOLCONDA IL
2018-08-01 757-571 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K FRANKLIN VA
2018-08-01 815-551 0XXX1XXX2XXX5XXX6XXX · 2 holders which blocks → ONVOY, LLC 224C LANARK IL
2018-08-01 902-970 not yet reported which blocks → Iristel Inc. 154E Amherst —
2018-07-31 272-223 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 HAZLETON PA
2018-07-31 272-224 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 POTTSVILLE PA
2018-07-31 424-418 not yet reported which blocks → SHELCOMM 0051 BEVERLYHLS CA
2018-07-31 442-299 not yet reported which blocks → SHELCOMM 0051 VTVL HSPR CA
2018-07-31 562-389 not yet reported which blocks → SHELCOMM 0051 ALAMITOS CA
2018-07-31 603-403 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J ROCHESTER NH
2018-07-31 626-477 not yet reported which blocks → SHELCOMM 0051 ALHAMBRA CA
2018-07-31 657-362 not yet reported which blocks → SHELCOMM 0051 ANAHEIM CA
2018-07-31 661-419 not yet reported which blocks → SHELCOMM 0051 HI VISTA CA
2018-07-31 747-280 not yet reported which blocks → SHELCOMM 0051 NO HOLLYWD CA
2018-07-31 802-210 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VT 451F ST ALBANS VT
2018-07-31 805-992 not yet reported which blocks → SHELCOMM 0051 MOORPARK CA
2018-07-31 820-201 not yet reported which blocks → SHELCOMM 0051 OXNARD CA

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.