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
— 414-906 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-907 not yet reported which blocks → SPOK, INC. 6630 MILWAUKZN1 WI
— 414-908 not yet reported which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 MILWAUKZN1 WI
— 414-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 414-915 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-916 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILWAUKZN1 WI
— 414-917 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MILWAUKZN1 WI
— 414-918 not yet reported which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 MILWAUKZN1 WI
— 414-921 6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MILWAUKZN1 WI
— 414-931 1XXX7XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-933 6XXX8XXX which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-934 6XXX which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-935 2XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-936 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-937 0XXX1XXX5XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-940 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MILWAUKZN1 WI
— 414-941 not yet reported which blocks → SPOK, INC. 6630 MILWAUKZN1 WI
— 414-943 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILWAUKZN1 WI
— 414-944 1XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILWAUKZN1 WI
— 414-950 not yet reported which blocks → WI
— 414-955 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-958 not yet reported which blocks → MILWAUKZN1 WI
— 414-959 not yet reported which blocks → WI
— 414-961 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-962 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-963 5XXX which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-964 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-967 not yet reported which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
— 414-973 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MILWAUKZN4 WI
— 414-975 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
— 414-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 414-977 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MILWAUKZN1 WI
— 414-978 7XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MILWAUKZN1 WI
— 414-979 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN4 WI
— 414-981 not yet reported which blocks → SPOK, INC. 6630 MILWAUKZN1 WI
— 415-200 5XXX6XXX7XXX8XXX9XXX which blocks → IP HORIZON LLC 515J SNFC CNTRL CA
— 415-201 not yet reported which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SNFC CNTRL CA
— 415-202 3XXX4XXX5XXX6XXX · 2 holders which blocks → PACIFIC BELL 9740 SNFC CNTRL CA
— 415-203 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
— 415-204 not yet reported which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SNFC CNTRL CA
— 415-205 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
— 415-206 not yet reported which blocks → PACIFIC BELL 9740 SNFC CNTRL CA
— 415-207 not yet reported which blocks → SPOK, INC. 6630 SNFC CNTRL CA
— 415-209 3XXX4XXX5XXX8XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 2319 NOVATO CA
— 415-210 not yet reported which blocks → SPOK, INC. 6630 SNFC CNTRL CA
— 415-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 415-213 2XXX3XXX4XXX5XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC MT-EV CA
— 415-215 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
— 415-216 3XXX5XXX6XXX7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
— 415-217 9XXX which blocks → PACIFIC BELL 9740 SNFC CNTRL CA

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.