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
— 650-248 2XXX which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
— 650-249 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CA 649C REDWOOD CY CA
— 650-251 4XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-254 3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-255 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
— 650-256 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SSNFRNCSCO CA
— 650-257 0XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDWOOD CY CA
— 650-259 none assigned yet which blocks → PACIFIC BELL 9740 MILLBRAE CA
— 650-260 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AT&T - LOCAL 7421 REDWOOD CY CA
— 650-261 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-262 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PESCADERO CA
— 650-263 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MOSS BEACH CA
— 650-264 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → AT&T - LOCAL 7421 SNCRL-BLMT CA
— 650-265 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 MT VIEW CA
— 650-266 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-267 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-268 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PESCADERO CA
— 650-269 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
— 650-270 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SSNFRNCSCO CA
— 650-273 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ASTOUND BROADBAND, LLC - CA 485E SSNFRNCSCO CA
— 650-274 0XXX which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-275 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WOODSIDE CA
— 650-276 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 HALFMOONBY CA
— 650-277 not yet reported which blocks → 33 WIRELESS INC. 6967 REDWOOD CY CA
— 650-279 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MT VIEW CA
— 650-280 none assigned yet which blocks → METROPCS, INC. 5562 MT VIEW CA
— 650-281 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-282 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → ASTOUND BROADBAND, LLC - CA 485E MT VIEW CA
— 650-284 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 HALFMOONBY CA
— 650-286 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-287 5XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-288 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-289 8XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-291 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SSNFRNCSCO CA
— 650-292 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-293 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-294 0XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-295 0XXX1XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-296 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
— 650-297 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PESCADERO CA
— 650-298 1XXX2XXX which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-299 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-300 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C PALO ALTO CA
— 650-301 not yet reported which blocks → PACIFIC BELL 9740 SNFC JUNPR CA
— 650-302 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MILLBRAE CA
— 650-303 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
— 650-306 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-312 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-314 1XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW 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.