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
2020-01-17 707-231 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SONOMA CA
2020-01-13 707-727 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 UKIAH CA
2019-10-24 707-626 0XXX1XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BOONVILLE CA
2019-10-07 707-828 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BENICIA CA
2019-09-13 707-804 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ST HELENA CA
2019-08-27 707-705 0XXX1XXX2XXX3XXX5XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F VALLEYFORD CA
2019-08-27 707-802 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MIDDLETOWN CA
2019-08-26 707-680 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - CA 6261 WILLITS CA
2019-07-12 707-830 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HOPLAND CA
2019-05-28 707-713 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ARCATA CA
2019-04-01 707-719 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J BLUE LAKE CA
2019-03-20 707-855 0XXX1XXX2XXX3XXX5XXX · 5 holders which blocks → FRACTEL, LLC 965H POTTER VLY CA
2019-03-20 707-899 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SANTA ROSA CA
2019-03-04 707-316 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DIXON CA
2018-12-24 707-740 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EUREKA CA
2018-12-04 707-717 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FORTUNA CA
2018-12-04 707-801 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C KENWOOD CA
2018-11-29 707-660 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 VACAVILLE CA
2018-08-31 707-503 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C SEBASTOPOL CA
2018-03-23 707-919 0–9 XXXall 10 · 8 holders which blocks → METROPCS, INC. 5562 SANTA ROSA CA
2018-03-22 707-699 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L NAPA CA
2018-03-08 707-920 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2017-12-21 707-615 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SANTA ROSA CA
2017-12-12 707-608 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WINDSOR CA
2017-11-30 707-730 0–9 XXXall 10 · 9 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 LAKEPORT CA
2017-11-29 707-661 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CALISTOGA CA
2017-11-10 707-898 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VACAVILLE CA
2017-09-20 707-209 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 VALLEJO CA
2017-02-10 707-613 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EUREKA CA
2016-06-27 707-806 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ROSA CA
2016-06-24 707-710 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SANTA ROSA CA
2016-06-22 707-308 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ROSA CA
2016-04-21 707-305 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 VACAVILLE CA
2016-03-18 707-757 0–9 XXXall 10 · 6 holders which blocks → SONIC TELECOM, LLC - CA 433E SANTA ROSA CA
2016-03-11 707-229 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C TMCV SERN CA
2016-03-11 707-715 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C COBB MT CA
2016-03-09 707-610 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CLOVERDALE CA
2016-03-03 707-210 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C SONOMA CA
2016-02-24 707-917 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C VALLEJO CA
2016-01-12 707-203 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - CA 649C ELK CA
2016-01-12 707-606 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C BENICIA CA
2015-11-23 707-819 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NAPA CA
2015-11-13 707-683 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EUREKA CA
2015-09-04 707-314 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MONTE RIO CA
2015-08-26 707-708 0–9 XXXall 10 · 5 holders which blocks → SONIC TELECOM, LLC - CA 433E SANTA ROSA CA
2015-07-06 707-805 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VALLEJO CA
2015-06-12 707-842 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E WHITETHORN CA
2015-06-12 707-880 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VACAVILLE CA
2015-05-27 707-979 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MENDOCINO CA
2015-04-27 707-714 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E UKIAH 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.