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
2008-12-01 916-585 0–9 XXXall 10 · 5 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 ELK GROVE CA
2008-11-10 916-637 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J SCRM MAIN CA
2008-10-31 916-550 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2008-05-02 916-993 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM NORTH CA
2008-04-16 916-865 0–9 XXXall 10 · 6 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2008-04-02 916-538 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SCRM MAIN CA
2008-04-02 916-667 0–9 XXXall 10 · 6 holders which blocks → CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 2308 ELK GROVE CA
2007-11-16 916-514 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2007-09-27 916-509 0–9 XXXall 10 · 7 holders which blocks → CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 2308 ELK GROVE CA
2007-09-18 916-504 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SCRM MAIN CA
2007-09-15 916-476 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
2007-09-11 916-469 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
2007-05-29 916-409 0–9 XXXall 10 · 7 holders which blocks → PACIFIC BELL 9740 LINCOLN CA
2007-03-30 916-474 0–9 XXXall 10 · 4 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2007-03-23 916-400 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2007-02-06 916-872 0–9 XXXall 10 · 7 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2007-01-26 916-380 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 RSVL MAIN CA
2007-01-17 916-333 0–9 XXXall 10 · 5 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 SCRM NORTH CA
2006-11-21 916-222 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CA 649C MICHIGNBAR CA
2006-09-26 916-517 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 RSVL MAIN CA
2006-09-25 916-897 0–9 XXXall 10 · 5 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 ELK GROVE CA
2006-06-28 916-706 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2006-03-17 916-842 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SCRM MAIN CA
2006-01-25 916-467 0–9 XXXall 10 · 7 holders which blocks → AT&T ENTERPRISES, LLC 516C FOLSOM CA
2005-10-31 916-672 0–9 XXXall 10 · 6 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 SO PLACER CA
2005-10-31 916-749 0–9 XXXall 10 · 6 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2005-10-21 916-627 0–9 XXXall 10 · 5 holders which blocks → CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 2308 ELK GROVE CA
2005-10-11 916-770 0–9 XXXall 10 · 5 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2005-09-30 916-647 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ELK GROVE CA
2005-09-26 916-753 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ELK GROVE CA
2005-03-09 916-273 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SCRM MAIN CA
2005-02-01 916-949 0–9 XXXall 10 · 2 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SCRM MAIN CA
2005-01-03 916-873 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM MAIN CA
2004-11-15 916-889 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SCRM MAIN CA
2004-07-01 916-293 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FOLSOM CA
2002-07-17 916-613 not yet reported which blocks → METROPCS, INC. 5562 SCRM NORTH CA
2002-05-17 916-821 not yet reported which blocks → METROPCS, INC. 5562 SCRM MAIN CA
2002-04-16 916-792 0XXX1XXX2XXX3XXX4XXX which blocks → METROPCS, INC. 5562 RSVL MAIN CA
2002-03-22 916-741 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → METROPCS, INC. 5562 SO PLACER CA
2002-01-28 916-412 1XXX which blocks → T-MOBILE USA, INC. 6529 RSVL MAIN CA
2002-01-28 916-432 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RIO LINDA CA
2002-01-28 916-477 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WALNUT GRV CA
2001-12-28 916-220 not yet reported which blocks → T-MOBILE USA, INC. 6529 FOLSOM CA
2001-12-28 916-225 1XXX7XXX which blocks → T-MOBILE USA, INC. 6529 FAIR OAKS CA
2001-12-28 916-230 1XXX which blocks → T-MOBILE USA, INC. 6529 ELK GROVE CA
2001-12-28 916-370 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → METROPCS, INC. 5562 FOLSOM CA
2001-12-28 916-390 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FAIR OAKS CA
2001-11-30 916-271 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → METROPCS, INC. 5562 ELK GROVE CA
2001-11-30 916-289 not yet reported which blocks → METROPCS, INC. 5562 RSVL MAIN CA
2001-11-30 916-308 not yet reported which blocks → METROPCS, INC. 5562 FAIR OAKS 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.