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 707
PACIFIC BELL 225
ONVOY, LLC - CA 96
NEW CINGULAR WIRELESS PCS, LLC 67
LEVEL 3 COMMUNICATIONS, LLC - CA 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 55
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
2015-04-24 707-366 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FRFLD-SUIS CA
2015-04-16 707-867 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ROSA CA
2015-01-30 707-572 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EUREKA CA
2014-10-14 707-890 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ROSA CA
2014-09-23 707-564 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 VACAVILLE CA
2014-09-23 707-862 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2014-09-22 707-690 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 NAPA CA
2014-05-19 707-640 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DIXON CA
2014-02-11 707-607 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC VOICE, LLC 612K FERNDALE CA
2014-02-11 707-630 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K ARCATA CA
2014-02-11 707-686 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K LOLETA CA
2014-02-11 707-783 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K RIO DELL CA
2014-02-11 707-844 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K BLUE LAKE CA
2014-02-11 707-851 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K HYDESVILLE CA
2014-01-08 707-791 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ROSA CA
2013-11-04 707-798 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K EUREKA CA
2013-10-15 707-892 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WINDSOR CA
2013-07-30 707-530 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LAKEPORT CA
2013-03-27 707-379 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F VALLEYFORD CA
2013-03-25 707-306 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ANNAPOLIS CA
2013-03-18 707-368 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LEGGETT CA
2013-03-08 707-298 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F EUREKA CA
2013-03-08 707-329 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SEBASTOPOL CA
2013-03-08 707-390 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PEPPERWOOD CA
2013-03-08 707-492 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NAPA CA
2013-03-08 707-617 0–9 XXXall 10 · 9 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FORTUNA CA
2013-03-08 707-625 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FORESTVL CA
2013-03-08 707-663 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TMCV TMCV CA
2013-01-14 707-296 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EUREKA CA
2012-12-26 707-230 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 SANTA ROSA CA
2012-12-24 707-389 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2012-12-04 707-380 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UKIAH CA
2012-10-09 707-868 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TOMALES CA
2012-10-02 707-755 0–9 XXXall 10 · 5 holders which blocks → SONIC TELECOM, LLC - CA 433E SANTA ROSA CA
2012-09-04 707-346 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NAPA CA
2012-08-13 707-724 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VACAVILLE CA
2012-07-17 707-392 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 VACAVILLE CA
2012-03-22 707-388 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C ARCATA CA
2011-11-21 707-387 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ROSA CA
2011-08-09 707-382 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EUREKA CA
2011-08-01 707-532 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C LOLETA CA
2011-06-08 707-978 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ROSA CA
2011-06-01 707-883 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E UPPER LAKE CA
2011-02-21 707-273 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 EUREKA CA
2010-07-20 707-378 0–9 XXXall 10 · 6 holders which blocks → CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 2308 RIO VISTA CA
2010-06-29 707-600 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K NICE CA
2010-05-11 707-595 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SANTA ROSA CA
2010-01-14 707-415 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 YOUNTVILLE CA
2009-11-24 707-605 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - CA 649C POTTER VLY CA
2009-11-24 707-681 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C NAPA 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.