NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
2004-12-15 951-623 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2004-12-14 252-722 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J COINJOCK NC
2004-12-14 252-876 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J NEW BERN NC
2004-12-14 309-626 0XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F ORION IL
2004-12-14 603-831 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 GREENFIELD NH
2004-12-14 716-785 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 FREDONIA NY
2004-12-14 828-404 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J HICKORY NC
2004-12-14 860-477 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K STORRS CT
2004-12-14 905-419 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Bowmanville —
2004-12-14 905-425 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Brooklin —
2004-12-14 905-445 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Hampton —
2004-12-14 905-446 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Newcastle —
2004-12-14 905-485 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Orono —
2004-12-14 905-492 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B South Pickering —
2004-12-14 905-493 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Whitby —
2004-12-14 905-956 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Malton —
2004-12-14 905-997 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Streetsville —
2004-12-13 210-855 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 8434 SANANTONIO TX
2004-12-13 214-996 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 DALLAS TX
2004-12-13 240-394 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNT AIRY MD
2004-12-13 512-727 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
2004-12-13 540-244 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 LURAY VA
2004-12-13 636-393 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K PACIFIC MO
2004-12-13 636-887 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WENTZVILLE MO
2004-12-13 713-583 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HOUSTON TX
2004-12-13 740-882 2XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CUMBERLAND OH
2004-12-13 812-787 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 MONTGOMERY IN
2004-12-13 817-603 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 FORT WORTH TX
2004-12-13 817-830 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 NRICHLDHLS TX
2004-12-13 817-977 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 ARLINGTON TX
2004-12-13 905-860 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Caledon East —
2004-12-13 905-916 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Clarkson —
2004-12-13 905-990 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Port Credit —
2004-12-13 905-996 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Snelgrove —
2004-12-13 905-998 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Victoria —
2004-12-13 909-522 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D S BERNDINO CA
2004-12-13 985-218 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J LACOMBE LA
2004-12-10 435-491 0XXX1XXX2XXX7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BICKNELL UT
2004-12-10 580-461 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 GUYMON OK
2004-12-10 905-503 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Aurora —
2004-12-10 905-533 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Bolton —
2004-12-10 905-534 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Gormley —
2004-12-10 905-535 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Keswick —
2004-12-10 905-539 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B King City —
2004-12-10 905-552 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Kleinburg —
2004-12-10 912-314 6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 METTER GA
2004-12-09 309-508 not yet reported which blocks → MTCO COMMUNICATIONS, INC. 4837 METAMORA IL
2004-12-09 320-434 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 LITCHFIELD MN
2004-12-09 480-277 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-12-09 859-218 not yet reported which blocks → WINDSTREAM KENTUCKY EAST, INC. - LEXINGTON 9690 LEXINGTON KY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.