NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 27
ONVOY, LLC - NJ 20
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
2004-05-13 352-668 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANANTONIO FL
2004-05-13 617-894 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2004-05-13 660-274 1XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 KING CITY MO
2004-05-13 850-348 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 PANAMACITY FL
2004-05-13 850-363 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 TALLAHASSE FL
2004-05-12 416-552 not yet reported which blocks → Bell Canada 8051 Toronto —
2004-05-12 416-914 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 8377 Toronto —
2004-05-12 450-580 not yet reported which blocks → TELUS Quebec 2243 Le Gardeur —
2004-05-12 450-970 not yet reported which blocks → TELUS Quebec 2243 Ste-Therese —
2004-05-12 706-401 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 WASHINGTON GA
2004-05-12 815-826 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SOMONAUK IL
2004-05-11 250-244 not yet reported which blocks → Bell West Inc. 2933 Nanaimo —
2004-05-10 406-334 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIBBY MT
2004-05-10 507-410 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MN 184D ROLLINGSTN MN
2004-05-10 507-417 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MN 184D NEW RICHLD MN
2004-05-10 606-472 not yet reported which blocks → WINDSTREAM KENTUCKY EAST, INC. - LEXINGTON 9690 GRAYSON KY
2004-05-10 740-917 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 RATHBONE OH
2004-05-10 816-377 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KANSASCITY MO
2004-05-10 909-561 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2004-05-10 912-271 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 HINESVILLE GA
2004-05-10 918-837 4XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 JAY OK
2004-05-07 201-285 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J BAYONNE NJ
2004-05-07 214-888 0–9 XXXall 10 · 4 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D DALLAS TX
2004-05-07 585-354 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2004-05-07 845-589 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7650 CONGERS NY
2004-05-06 250-331 not yet reported which blocks → TELUS 8086 Courtenay —
2004-05-06 250-469 not yet reported which blocks → TELUS 8086 Kelowna —
2004-05-06 450-735 not yet reported which blocks → Videotron Ltd. 8306 St-Eustache —
2004-05-06 450-736 not yet reported which blocks → Videotron Ltd. 8306 Ste-Rose —
2004-05-06 541-216 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - OR 6349 ONTARIO OR
2004-05-06 563-203 3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CRESCO IA
2004-05-06 617-366 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
2004-05-06 641-229 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 NEWHAMPTON IA
2004-05-06 651-448 2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 LAKE CITY MN
2004-05-06 980-359 0–9 XXXwhole prefix which blocks → WINDSTREAM COMMUNICATIONS, INC. - NC 7970 CHARLOTTE NC
2004-05-05 403-456 not yet reported which blocks → Primus Telecommunications Canada Inc. 201A Calgary —
2004-05-05 509-219 0–9 XXXall 10 · 7 holders which blocks → AXXIS COMMUNICATION, INC. - WA 5844 STEVENSON WA
2004-05-05 604-701 not yet reported which blocks → TELUS 8086 Chilliwack —
2004-05-05 608-406 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 LA CROSSE WI
2004-05-05 780-328 not yet reported which blocks → Primus Telecommunications Canada Inc. 201A Edmonton —
2004-05-05 787-463 0–9 XXXall 10 · 2 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 CAROLINA PR
2004-05-05 816-284 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CAMERON MO
2004-05-04 208-215 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - ID 689F COERDALENE ID
2004-05-04 240-276 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2004-05-04 405-428 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LINDSAY OK
2004-05-04 507-242 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 BLOOMNPRRI MN
2004-05-04 507-353 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MN 184D ZUMBRO FLS MN
2004-05-04 508-731 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K OXFORD MA
2004-05-04 580-567 5XXX7XXX · 2 holders which blocks → UNITED STATES CELLULAR - OK 6272 WILLOW OK
2004-05-04 646-888 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J NWYRCYZN01 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.