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
2014-08-21 916-634 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2014-08-12 916-584 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2014-08-05 916-407 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SCRM NORTH CA
2014-08-04 916-430 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2014-08-04 916-827 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FAIR OAKS CA
2014-07-25 916-582 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELK GROVE CA
2014-06-20 916-318 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SCRM MAIN CA
2014-06-16 916-805 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FOLSOM CA
2014-04-10 916-742 0–9 XXXall 10 · 5 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2014-03-27 916-936 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2014-03-20 916-696 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SCRM NORTH CA
2014-03-04 916-581 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN CA
2013-12-19 916-330 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SCRM MAIN CA
2013-11-26 916-597 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FOLSOM CA
2013-11-18 916-917 0–9 XXXall 10 · 5 holders which blocks → WIDE VOICE, LLC - CA 252F SCRM MAIN CA
2013-10-07 916-661 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 SCRM MAIN CA
2013-09-23 916-846 0–9 XXXall 10 · 5 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2013-09-23 916-887 0–9 XXXwhole prefix which blocks → PACIFIC BELL 9740 SCRM MAIN CA
2013-09-13 916-571 0–9 XXXall 10 · 7 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2013-07-30 916-385 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELK GROVE CA
2013-06-21 916-540 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 RSVL MAIN CA
2013-06-19 916-472 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RSVL MAIN CA
2013-03-25 916-347 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FAIR OAKS CA
2013-03-04 916-246 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 SCRM NORTH CA
2012-11-21 916-389 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SCRM MAIN CA
2012-11-15 916-297 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RSVL MAIN CA
2012-10-16 916-587 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C LINCOLN CA
2012-09-10 916-542 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FOLSOM CA
2012-09-07 916-292 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2012-06-07 916-462 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J RSVL MAIN CA
2012-02-20 916-426 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM NORTH CA
2011-03-15 916-895 0–9 XXXall 10 · 4 holders which blocks → FRONTIER COMMUNICATIONS OF AMERICA, INC. - CA 006E ELK GROVE CA
2010-12-23 916-945 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 RSVL MAIN CA
2010-12-10 916-877 0–9 XXXall 10 · 3 holders which blocks → PACIFIC BELL 9740 SCRM NORTH CA
2010-11-23 916-918 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RSVL MAIN CA
2010-08-11 916-905 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SCRM MAIN CA
2010-07-12 916-790 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2010-06-04 916-913 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM NORTH CA
2010-06-01 916-757 0–9 XXXall 10 · 3 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2010-02-15 916-512 0–9 XXXall 10 · 5 holders which blocks → CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 2308 ELK GROVE CA
2010-01-21 916-896 0–9 XXXall 10 · 4 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 ELK GROVE CA
2009-11-23 916-822 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SCRM MAIN CA
2009-05-07 916-287 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SCRM MAIN CA
2009-04-28 916-668 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SCRM MAIN CA
2009-04-07 916-740 0–9 XXXall 10 · 5 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 3964 RSVL MAIN CA
2009-03-25 916-692 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM NORTH CA
2009-03-05 916-572 0–9 XXXall 10 · 2 holders which blocks → ASTOUND BROADBAND, LLC - CA 485E SCRM MAIN CA
2009-03-02 916-678 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM NORTH CA
2009-02-13 916-544 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ELK GROVE CA
2009-02-13 916-546 0–9 XXXall 10 · 5 holders 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.