NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
2013-07-01 805-387 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SIMIVALLEY CA
2013-06-28 316-226 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WICHITA KS
2013-06-28 415-638 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2013-06-28 512-962 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2013-06-28 512-987 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2013-06-28 513-486 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MASON OH
2013-06-28 631-296 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K BRIDGEMPTN NY
2013-06-28 702-826 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2013-06-28 714-340 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 YORBALINDA CA
2013-06-28 803-672 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 DENMARK SC
2013-06-28 872-236 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-06-28 872-238 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-06-28 901-364 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 MEMPHIS TN
2013-06-28 901-376 0–9 XXXwhole prefix which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 MEMPHIS TN
2013-06-28 954-451 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E FTLAUDERDL FL
2013-06-28 956-422 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMA TX
2013-06-27 202-751 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN1 DC
2013-06-27 289-454 not yet reported which blocks → Zayo Canada Inc. 8304 Cooksville —
2013-06-27 289-457 not yet reported which blocks → Zayo Canada Inc. 8304 Streetsville —
2013-06-27 317-672 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J INDIANAPLS IN
2013-06-27 343-291 not yet reported which blocks → Zayo Canada Inc. 8304 Ottawa-Hull —
2013-06-27 505-219 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2013-06-27 559-385 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRESNO CA
2013-06-27 587-962 not yet reported which blocks → Zayo Canada Inc. 8304 Calgary —
2013-06-27 631-507 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2013-06-27 639-635 not yet reported which blocks → SaskTel 8091 Saskatoon —
2013-06-27 778-377 not yet reported which blocks → Zayo Canada Inc. 8304 Vancouver —
2013-06-27 803-636 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 COLUMBIA SC
2013-06-27 807-214 not yet reported which blocks → Keewaytinook Okimakanak 717G Sioux Lookout —
2013-06-27 872-234 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-06-26 313-315 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
2013-06-26 313-773 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
2013-06-26 313-812 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
2013-06-26 424-299 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNMN SNMN CA
2013-06-26 614-663 0–9 XXXall 10 · 5 holders which blocks → OHIO BELL TEL CO 9321 GROVE CITY OH
2013-06-26 740-271 5XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MINFD SKDL OH
2013-06-26 872-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2013-06-26 872-235 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2013-06-26 872-243 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2013-06-25 224-252 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E GRAYSLAKE IL
2013-06-25 224-253 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2013-06-25 440-370 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AMHERST OH
2013-06-25 440-403 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BEREA OH
2013-06-25 440-421 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HILLCREST OH
2013-06-25 520-213 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2013-06-25 614-681 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WORTHINGTN OH
2013-06-25 720-550 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J DENVER CO
2013-06-25 778-760 not yet reported which blocks → Iristel Inc. 154E Kelowna —
2013-06-25 989-251 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 OWOSSO MI
2013-06-24 317-665 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.