NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 262-510 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 WAUKESHA WI
— 262-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 262-512 not yet reported which blocks → WISCONSIN BELL INC 9327 THIENSVL WI
— 262-513 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-514 not yet reported which blocks → SOUTHEAST TEL. CO. OF WISCONSIN, INC. 0952 WATERFORD WI
— 262-518 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 THIENSVL WI
— 262-521 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-522 not yet reported which blocks → TDS METROCOM, LLC 520K WAUKESHA WI
— 262-523 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-524 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-528 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MERTON WI
— 262-532 not yet reported which blocks → WISCONSIN BELL INC 9327 MENOMONFLS WI
— 262-533 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MERTON WI
— 262-534 not yet reported which blocks → SOUTHEAST TEL. CO. OF WISCONSIN, INC. 0952 WATERFORD WI
— 262-536 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - WI 225C PTWASHIGTN WI
— 262-537 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BURLINGTON, BRIGHTON & WHEATLAND TEL. CO. 0856 WHEATLAND WI
— 262-538 6XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MERTON WI
— 262-539 0XXX1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BURLINGTON, BRIGHTON & WHEATLAND TEL. CO. 0856 BOHNERS LK WI
— 262-542 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-544 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-546 6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CEDARBURG WI
— 262-547 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-548 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-549 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-551 1XXX3XXX4XXX · 3 holders which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-552 6XXX which blocks → WISCONSIN BELL INC 9327 PARKSIDE WI
— 262-553 2XXX6XXX8XXX · 3 holders which blocks → WISCONSIN BELL INC 9327 PARKSIDE WI
— 262-554 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WI
— 262-558 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 UNIONGROVE WI
— 262-560 not yet reported which blocks → WISCONSIN BELL INC 9327 OCONOMOWOC WI
— 262-563 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 HARTLAND WI
— 262-564 5XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-565 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WAUKESHA WI
— 262-567 not yet reported which blocks → WISCONSIN BELL INC 9327 OCONOMOWOC WI
— 262-569 not yet reported which blocks → WISCONSIN BELL INC 9327 OCONOMOWOC WI
— 262-573 0XXX2XXX which blocks → METROPCS, INC. 5562 WEST BEND WI
— 262-574 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-584 2XXX4XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SOMERS WI
— 262-586 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SALEM WI
— 262-592 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 EAGLE WI
— 262-593 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 SULLIVAN WI
— 262-594 0XXX1XXX4XXX7XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 EAGLE WI
— 262-595 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 PARKSIDE WI
— 262-597 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-598 4XXX6XXX7XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-605 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 262-612 0XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 KENOSHA WI
— 262-613 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 WAUKESHA WI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.