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 209
PACIFIC BELL 181
NEW CINGULAR WIRELESS PCS, LLC 128
ONVOY, LLC - CA 76
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 71
T-MOBILE USA, INC. 69
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
2015-06-05 209-636 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 STOCKTON CA
2015-05-18 209-455 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C MERCED CA
2015-05-14 209-497 0–9 XXXall 10 · 6 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 MODESTO CA
2015-05-04 209-486 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2015-04-16 209-696 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2015-04-10 209-431 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E JAMESTOWN CA
2015-04-10 209-457 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E IONE CA
2015-04-01 209-270 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LOS BANOS CA
2015-04-01 209-302 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MANTECA CA
2015-04-01 209-452 0–9 XXXall 10 · 7 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 LODI CA
2015-04-01 209-453 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2015-03-20 209-422 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MODESTO CA
2015-03-16 209-447 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MODESTO CA
2015-03-13 209-445 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ATWATER CA
2015-03-13 209-446 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MERCED CA
2015-03-13 209-448 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HUGHSON CA
2015-03-10 209-454 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNRA MAIN CA
2015-03-09 209-427 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 TURLOCK CA
2015-03-04 209-273 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 JACKSON CA
2015-03-04 209-425 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 STOCKTON CA
2015-03-02 209-949 0–9 XXXall 10 · 4 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 STOCKTON CA
2015-01-20 209-421 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MERCED CA
2014-11-18 209-426 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LODI CA
2014-11-05 209-362 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TRACY CA
2014-11-03 209-361 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 STOCKTON CA
2014-10-20 209-289 0–9 XXXall 10 · 5 holders which blocks → XO CALIFORNIA, INC. 7262 MODESTO CA
2014-09-30 209-284 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MODESTO CA
2014-09-23 209-326 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ATWATER CA
2014-09-23 209-328 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MANTECA CA
2014-08-28 209-689 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F STOCKTON CA
2014-08-12 209-715 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 STOCKTON CA
2014-08-01 209-850 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TURLOCK CA
2014-05-30 209-851 0–9 XXXall 10 · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J STOCKTON CA
2014-04-24 209-843 0–9 XXXall 10 · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GALT CA
2014-04-14 209-650 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TRACY CA
2014-04-14 209-822 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ANGELSCAMP CA
2014-03-21 209-857 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2014-03-04 209-355 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MERCED CA
2014-03-03 209-325 0–9 XXXall 10 · 6 holders which blocks → PACIFIC BELL 9740 MERCED CA
2014-02-28 209-252 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E TURLOCK CA
2014-01-17 209-294 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LODI CA
2013-12-13 209-283 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 JACKSON CA
2013-12-11 209-353 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MODESTO CA
2013-11-08 209-737 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LOS BANOS CA
2013-07-11 209-292 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2013-05-06 209-276 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ATWATER CA
2012-05-11 209-226 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 TURLOCK CA
2012-04-30 209-272 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2012-03-29 209-269 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LODI CA
2011-12-23 209-317 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C COULTERVL 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.