NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2011-01-04 337-777 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J PORT BARRE LA
2011-01-03 513-500 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
2011-01-03 956-290 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAREDO TX
2010-12-29 206-743 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F SEATTLE WA
2010-12-29 270-649 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - KY 781F TOMPKINSVL KY
2010-12-29 407-300 0–9 XXXwhole prefix which blocks → METROPCS NETWORKS, LLC 899D ORLANDO FL
2010-12-29 407-600 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D ORLANDO FL
2010-12-29 407-730 0–9 XXXall 10 · 2 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L ORLANDO FL
2010-12-29 606-557 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K ALBANY KY
2010-12-29 702-998 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV 9145 LAS VEGAS NV
2010-12-29 956-270 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 EDINBURG TX
2010-12-29 956-329 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EDINBURG TX
2010-12-29 956-355 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 WESLACO TX
2010-12-29 956-402 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 PHARR TX
2010-12-28 270-548 1XXX2XXX3XXX4XXX7XXX · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - KY 781F TEMPLEHILL KY
2010-12-28 347-775 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J NWYRCYZN06 NY
2010-12-28 480-646 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY LLC 593K PHOENIX AZ
2010-12-28 561-600 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E BOYNTONBCH FL
2010-12-28 720-452 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF COLORADO, LLC - CO 278F DENVER CO
2010-12-28 720-633 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-12-28 845-655 0–9 XXXall 10 · 7 holders which blocks → FRONTIER COMMUNICATIONS OF NEW YORK, INC. 0100 MONROE NY
2010-12-23 204-514 not yet reported which blocks → Distributel 081E Winnipeg —
2010-12-23 306-897 not yet reported which blocks → SaskTel Mobility 9868 Weyburn —
2010-12-23 347-799 0–9 XXXall 10 · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NWYRCYZN06 NY
2010-12-23 352-800 0–9 XXXall 10 · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 EUSTIS FL
2010-12-23 438-937 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2010-12-23 517-715 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLCV - MI 543C FOWLERVL MI
2010-12-23 616-319 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C LOWELL MI
2010-12-23 650-308 0–9 XXXall 10 · 5 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
2010-12-23 801-875 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-12-23 801-960 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2010-12-23 801-989 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2010-12-23 916-945 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 RSVL MAIN CA
2010-12-23 917-563 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NWYRCYZN09 NY
2010-12-23 939-277 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-281 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-282 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-283 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-284 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-285 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-286 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-287 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 956-590 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNSVL TX
2010-12-23 989-502 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C FRANKENMTH MI
2010-12-22 289-909 not yet reported which blocks → Videotron Ltd. 383F Newmarket —
2010-12-22 289-994 not yet reported which blocks → Videotron Ltd. 383F Hamilton —
2010-12-22 317-600 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2010-12-22 317-800 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2010-12-22 434-338 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J LYNCHBURG VA
2010-12-22 647-606 not yet reported which blocks → Videotron Ltd. 383F Toronto —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.