NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
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
2017-10-09 231-666 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C MUSKEGON MI
2017-10-09 336-654 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MILTON NC
2017-10-09 479-247 0XXX9XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 WEST FORK AR
2017-10-09 539-225 2XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GORE OK
2017-10-09 539-227 2XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KINTA OK
2017-10-09 539-331 1XXX2XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 QUINTON OK
2017-10-09 539-414 2XXX4XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PORUM OK
2017-10-09 539-636 2XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WEBBERSFLS OK
2017-10-09 608-517 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 FENNIMORE WI
2017-10-09 608-569 2XXX7XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BAGLEY WI
2017-10-09 608-859 6XXX7XXX9XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BEETOWN WI
2017-10-09 619-439 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LA MESA CA
2017-10-09 620-201 0XXX2XXX · 2 holders which blocks → UNITED COMMUNICATIONS ASSOCIATION, INC. - KS 925G HAVILAND KS
2017-10-09 838-777 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC- NY 384C PHILMONT NY
2017-10-06 220-666 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C BALTIMORE OH
2017-10-06 223-222 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - PA 547E PALMYRA PA
2017-10-06 260-252 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 FREMONT IN
2017-10-06 581-502 not yet reported which blocks → Iristel Inc. 154E Levis —
2017-10-06 586-800 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-10-06 778-949 not yet reported which blocks → Iristel Inc. 154E Dawson Creek —
2017-10-06 810-666 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2017-10-06 825-256 not yet reported which blocks → Iristel Inc. 154E Calgary —
2017-10-05 540-702 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2017-10-05 662-999 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MS 719E WEST MS
2017-10-05 779-242 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2017-10-05 779-243 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FRANKFORT IL
2017-10-05 779-244 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCHENRY IL
2017-10-05 863-238 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E AVON PARK FL
2017-10-05 970-666 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - CO 026D FT COLLINS CO
2017-10-04 269-666 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C KALAMAZOO MI
2017-10-04 346-278 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANVEL TX
2017-10-04 365-604 not yet reported which blocks → Iristel Inc. 154E Oakville —
2017-10-04 581-204 not yet reported which blocks → Iristel Inc. 154E Alma —
2017-10-04 581-707 not yet reported which blocks → Iristel Inc. 154E Quebec —
2017-10-04 581-708 not yet reported which blocks → Iristel Inc. 154E Chicoutimi —
2017-10-04 581-808 not yet reported which blocks → Iristel Inc. 154E St-Tite-des-Caps —
2017-10-04 608-653 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J VERONA WI
2017-10-04 608-899 0XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WOODMAN WI
2017-10-04 616-600 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C GRAND RPDS MI
2017-10-04 628-250 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2017-10-04 639-388 not yet reported which blocks → Iristel Inc. 154E Rosthern —
2017-10-04 647-803 not yet reported which blocks → Videotron Ltd. 787G Toronto —
2017-10-04 647-804 not yet reported which blocks → Videotron Ltd. 787G Toronto —
2017-10-04 647-806 not yet reported which blocks → Videotron Ltd. 787G Toronto —
2017-10-04 719-259 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D COLORDOSPG CO
2017-10-04 757-600 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E NRFOLKZON2 VA
2017-10-04 814-666 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - PA 547E NORTH EAST PA
2017-10-04 828-679 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 HICKORY NC
2017-10-04 859-666 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - KY 896E WILLIAMSTN KY
2017-10-04 910-593 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 LUMBERTON NC

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.