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
— 262-618 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CEDARBURG WI
— 262-619 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-620 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KENOSHA WI
— 262-621 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LAKEGENEVA WI
— 262-622 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUBERTUS WI
— 262-623 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 HUBERTUS WI
— 262-626 0XXX7XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 KEWASKUM WI
— 262-627 1XXX2XXX3XXX5XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SLINGER WI
— 262-628 6XXX which blocks → WISCONSIN BELL INC 9327 HUBERTUS WI
— 262-629 0XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 ALLENTON WI
— 262-631 0XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-632 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-633 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-634 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-635 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-636 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-637 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-638 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-639 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-641 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN2 WI
— 262-642 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 EAST TROY WI
— 262-643 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 THIENSVL WI
— 262-644 3XXX which blocks → FRONTIER NORTH INC. - WI 0886 SLINGER WI
— 262-646 0XXX which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 DELAFIELD WI
— 262-650 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUKESHA WI
— 262-652 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-653 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-654 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-656 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-657 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-658 not yet reported which blocks → WISCONSIN BELL INC 9327 KENOSHA WI
— 262-661 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 BURLINGTON WI
— 262-662 6XXX8XXX which blocks → WISCONSIN BELL INC 9327 BIG BEND WI
— 262-664 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-667 2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 KEWASKUM WI
— 262-668 0XXX2XXX3XXX4XXX6XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 SLINGER WI
— 262-670 not yet reported which blocks → WISCONSIN BELL INC 9327 HARTFORD WI
— 262-673 not yet reported which blocks → WISCONSIN BELL INC 9327 HARTFORD WI
— 262-674 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 JACKSON WI
— 262-675 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WISCONSIN BELL INC 9327 NEWBURG WI
— 262-676 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 RACINE WI
— 262-677 not yet reported which blocks → WISCONSIN BELL INC 9327 JACKSON WI
— 262-679 not yet reported which blocks → WISCONSIN BELL INC 9327 MUSKEGO WI
— 262-681 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE WI
— 262-682 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MUSKEGO WI
— 262-683 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 ALLENTON WI
— 262-684 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 EAST TROY WI
— 262-685 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 NEWBURG WI
— 262-686 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 WILLIAMSBY WI
— 262-687 not yet reported which blocks → WISCONSIN BELL INC 9327 RACINE 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.