NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 916
PACIFIC BELL 237
NEW CINGULAR WIRELESS PCS, LLC 77
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 60
METROPCS, INC. 49
T-MOBILE USA, INC. 40
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
— 916-237 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 RIO LINDA CA
— 916-238 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 RIO LINDA CA
— 916-239 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → IP HORIZON LLC 515J SCRM NORTH CA
— 916-240 none assigned yet which blocks → METROPCS, INC. 5562 PLEASATGRV CA
— 916-241 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → IP HORIZON LLC 515J FAIR OAKS CA
— 916-242 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J RSVL CTHT CA
— 916-243 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E RIO LINDA CA
— 916-244 not yet reported which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
— 916-245 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SCRM MAIN CA
— 916-247 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
— 916-248 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
— 916-251 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 SO PLACER CA
— 916-252 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 PLEASATGRV CA
— 916-253 3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 LINCOLN CA
— 916-254 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM MAIN CA
— 916-255 7XXX which blocks → PACIFIC BELL 9740 SCRM MAIN CA
— 916-256 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM NORTH CA
— 916-257 none assigned yet which blocks → METROPCS, INC. 5562 RSVL MAIN CA
— 916-258 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LINCOLN CA
— 916-259 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SO PLACER CA
— 916-261 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
— 916-262 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 SCRM MAIN CA
— 916-263 not yet reported which blocks → PACIFIC BELL 9740 SCRM NORTH CA
— 916-264 9XXX which blocks → PACIFIC BELL 9740 SCRM MAIN CA
— 916-265 0XXX2XXX3XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM NORTH CA
— 916-266 1XXX3XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
— 916-267 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → AT&T - LOCAL 7421 SCRM MAIN CA
— 916-270 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WALNUT GRV CA
— 916-274 1XXX4XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 SCRM NORTH CA
— 916-275 none assigned yet which blocks → METROPCS, INC. 5562 SCRM NORTH CA
— 916-276 none assigned yet which blocks → METROPCS, INC. 5562 SO PLACER CA
— 916-277 0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 SCRM MAIN CA
— 916-278 not yet reported which blocks → PACIFIC BELL 9740 SCRM MAIN CA
— 916-281 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SCRM MAIN CA
— 916-282 8XXX9XXX · 2 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 SCRM MAIN CA
— 916-283 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → AT&T - LOCAL 7421 SCRM NORTH CA
— 916-284 none assigned yet which blocks → METROPCS, INC. 5562 SCRM MAIN CA
— 916-285 1XXX5XXX · 2 holders which blocks → PACIFIC BELL 9740 SCRM NORTH CA
— 916-286 9XXX which blocks → PACIFIC BELL 9740 SCRM NORTH CA
— 916-288 5XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
— 916-290 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 SCRM MAIN CA
— 916-294 5XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 FOLSOM CA
— 916-295 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 LINCOLN CA
— 916-296 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM MAIN CA
— 916-299 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - CA 649C PLEASATGRV CA
— 916-300 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RSVL MAIN CA
— 916-302 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TELNYX LLC 073H PLEASATGRV CA
— 916-303 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SO PLACER CA
— 916-304 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 MICHIGNBAR CA
— 916-307 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.