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
2018-03-06 360-743 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 ABERDEEN WA
2018-03-06 413-343 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D CHESTER MA
2018-03-06 424-425 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MALIBU CA
2018-03-06 515-385 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLARION IA
2018-03-06 515-902 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HUMBOLDT IA
2018-03-06 628-363 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2018-03-06 641-548 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2018-03-06 641-808 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLO IA
2018-03-06 701-997 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D FARGO ND
2018-03-06 734-539 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2018-03-06 734-899 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
2018-03-06 740-741 0XXX1XXX9XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 LTLHOCKING OH
2018-03-06 825-601 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2018-03-06 825-602 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2018-03-06 858-471 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-06 985-266 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - LA 749E HOUMA LA
2018-03-05 236-636 not yet reported which blocks → IXICA Communications Inc. 812H North Vancouver —
2018-03-05 236-663 not yet reported which blocks → IXICA Communications Inc. 812H West Vancouver —
2018-03-05 236-666 not yet reported which blocks → IXICA Communications Inc. 812H Vancouver —
2018-03-05 236-676 not yet reported which blocks → IXICA Communications Inc. 812H Squamish —
2018-03-05 236-756 not yet reported which blocks → IXICA Communications Inc. 812H Whalley —
2018-03-05 236-876 not yet reported which blocks → IXICA Communications Inc. 812H White Rock —
2018-03-05 236-906 not yet reported which blocks → IXICA Communications Inc. 812H Whonnock —
2018-03-05 276-277 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - VA 138E WYTHEVILLE VA
2018-03-05 314-924 0–9 XXXall 10 · 5 holders which blocks → EXIANT COMMUNICATIONS LLC 114J ST LOUIS MO
2018-03-05 316-553 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 GODDARD KS
2018-03-05 423-427 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TN 525E JOHNSON CY TN
2018-03-05 470-893 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA GA
2018-03-05 508-504 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MA 892D WEBSTER MA
2018-03-05 531-389 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2018-03-05 531-772 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OMAHA NE
2018-03-05 734-210 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ANN ARBOR MI
2018-03-05 757-956 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 NRFOLKZON3 VA
2018-03-05 816-845 0–9 XXXall 10 · 4 holders which blocks → EXIANT COMMUNICATIONS LLC 114J KANSASCITY MO
2018-03-05 828-820 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NC 638E ASHEVILLE NC
2018-03-05 850-805 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C PENSACOLA FL
2018-03-05 913-521 0–9 XXXall 10 · 5 holders which blocks → AVID COMMUNICATIONS, LLC - KS 742D KANSASCITY KS
2018-03-02 228-400 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MS 719E BILOXI MS
2018-03-02 236-256 not yet reported which blocks → IXICA Communications Inc. 812H Cloverdale —
2018-03-02 236-306 not yet reported which blocks → IXICA Communications Inc. 812H Port Moody —
2018-03-02 236-316 not yet reported which blocks → IXICA Communications Inc. 812H Fort Langley —
2018-03-02 236-318 not yet reported which blocks → IXICA Communications Inc. 812H Haney —
2018-03-02 236-376 not yet reported which blocks → IXICA Communications Inc. 812H Ladner —
2018-03-02 236-377 not yet reported which blocks → IXICA Communications Inc. 812H Langley —
2018-03-02 236-416 not yet reported which blocks → IXICA Communications Inc. 812H New Westminster —
2018-03-02 236-418 not yet reported which blocks → IXICA Communications Inc. 812H Newton —
2018-03-02 236-606 not yet reported which blocks → IXICA Communications Inc. 812H Port Coquitlam —
2018-03-02 236-616 not yet reported which blocks → IXICA Communications Inc. 812H Richmond —
2018-03-02 236-626 not yet reported which blocks → IXICA Communications Inc. 812H Pitt Meadows —
2018-03-02 413-571 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J WESTFIELD MA

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.