NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 650-315 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-316 0XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MT VIEW CA
— 650-317 not yet reported which blocks → SPOK, INC. 6630 MT VIEW CA
— 650-318 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-319 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PALO ALTO CA
— 650-320 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-321 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-322 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-323 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-324 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-325 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-326 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-327 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-328 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-329 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-330 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-331 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-332 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WOODSIDE CA
— 650-333 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SSNFRNCSCO CA
— 650-335 5XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-336 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-337 0XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - CA 649C PESCADERO CA
— 650-339 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCRL-BLMT CA
— 650-340 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-341 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-342 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-343 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-344 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-345 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-346 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-347 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-348 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-349 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-350 0XXX2XXX4XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-351 0XXX2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-352 3XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-353 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-354 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-355 not yet reported which blocks → PACIFIC BELL 9740 PACIFICA CA
— 650-356 8XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-357 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-358 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-359 not yet reported which blocks → PACIFIC BELL 9740 PACIFICA CA
— 650-360 not yet reported which blocks → ONVOY, LLC - CA 649C SSNFRNCSCO CA
— 650-361 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-362 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDWOOD CY CA
— 650-363 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-364 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-365 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-366 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.