NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 650
ONVOY, LLC - CA 2
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
2001-12-27 650-278 4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SSNFRNCSCO CA
2001-12-27 650-283 1XXX which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
2001-12-27 650-307 1XXX5XXX6XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILLBRAE CA
2001-12-27 650-430 not yet reported which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
2001-11-29 650-380 8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
2001-11-29 650-773 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN MATEO CA
2001-10-18 650-438 7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
2001-09-21 650-518 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 LOS ALTOS CA
2001-09-21 650-669 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 MT VIEW CA
2001-09-21 650-771 7XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 REDWOOD CY CA
2001-09-21 650-834 8XXX9XXX which blocks → METROPCS, INC. 5562 SSNFRNCSCO CA
2001-09-21 650-921 not yet reported which blocks → METROPCS, INC. 5562 SAN MATEO CA
2001-08-22 650-271 9XXX which blocks → METROPCS, INC. 5562 SNFC JUNPR CA
2001-08-22 650-290 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 PACIFICA CA
2001-08-22 650-630 9XXX which blocks → METROPCS, INC. 5562 PALO ALTO CA
2001-04-23 650-468 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
2001-03-01 650-922 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SSNFRNCSCO CA
2001-01-25 650-830 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
2001-01-25 650-995 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-200 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SAN MATEO CA
— 650-201 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SSNFRNCSCO CA
— 650-202 0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SAN MATEO CA
— 650-204 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MILLBRAE CA
— 650-205 not yet reported which blocks → SPOK, INC. 6630 SSNFRNCSCO CA
— 650-206 0–9 XXXall 10 · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WOODSIDE CA
— 650-207 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDWOOD CY CA
— 650-208 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDWOOD CY CA
— 650-209 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LOS ALTOS CA
— 650-210 4XXX6XXX7XXX · 3 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-212 5XXX6XXX · 2 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-213 2XXX6XXX7XXX · 3 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-215 0XXX1XXX3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MT VIEW CA
— 650-216 5XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-217 not yet reported which blocks → SPOK, INC. 6630 SAN MATEO CA
— 650-218 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-219 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SSNFRNCSCO CA
— 650-222 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-223 1XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PALO ALTO CA
— 650-224 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MT VIEW CA
— 650-225 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-226 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNCRL-BLMT CA
— 650-227 3XXX4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN MATEO CA
— 650-228 3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SSNFRNCSCO CA
— 650-229 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOS ALTOS CA
— 650-230 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MT VIEW CA
— 650-231 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILLBRAE CA
— 650-232 7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNCRL-BLMT CA
— 650-233 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-234 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO 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.