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 415
PACIFIC BELL 327
NEW CINGULAR WIRELESS PCS, LLC 67
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 48
T-MOBILE USA, INC. 45
ONVOY, LLC - CA 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
2014-01-08 415-870 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2013-12-13 415-930 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2013-11-22 415-805 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNFC CNTRL CA
2013-11-19 415-780 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2013-11-18 415-416 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - CA 252F SNFC CNTRL CA
2013-10-01 415-660 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2013-09-26 415-610 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2013-08-08 415-653 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2013-06-28 415-638 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2013-06-10 415-802 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2013-05-14 415-712 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BELVEDERE CA
2013-03-25 415-767 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SNFC CNTRL CA
2013-03-22 415-549 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNFC CNTRL CA
2013-03-09 415-761 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NOVATO CA
2013-02-18 415-521 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2013-01-29 415-635 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SNFC CNTRL CA
2012-12-04 415-696 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-11-29 415-231 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2012-11-23 415-481 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SNFC JUNPR CA
2012-11-23 415-589 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2012-11-06 415-757 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 551G SNFC CNTRL CA
2012-10-09 415-654 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SNFC CNTRL CA
2012-10-04 415-539 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-09-24 415-741 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2012-09-04 415-429 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2012-08-13 415-697 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-06-29 415-687 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-06-25 415-423 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-25 415-463 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2012-05-22 415-527 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNFC CNTRL CA
2012-05-21 415-535 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-04-12 415-580 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 SNFC CNTRL CA
2012-03-23 415-603 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2012-03-22 415-590 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2012-01-30 415-528 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2011-10-28 415-583 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-10-24 415-426 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2011-10-24 415-432 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNFC CNTRL CA
2011-08-23 415-470 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-08-18 415-361 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-08-09 415-316 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2011-08-04 415-340 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2011-07-25 415-266 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2011-06-14 415-523 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNFC CNTRL CA
2011-06-08 415-976 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 SNFC CNTRL CA
2011-06-07 415-906 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2011-05-26 415-926 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-05-11 415-866 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-05-11 415-940 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-05-10 415-967 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL 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.