NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
2010-03-26 289-977 not yet reported which blocks → Managed Network Systems Inc. 2776 Burlington —
2010-03-26 289-978 not yet reported which blocks → Managed Network Systems Inc. 2776 Hamilton —
2010-03-26 570-500 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 SHAMOKIN PA
2010-03-26 581-456 not yet reported which blocks → Videotron Ltd. 8306 Rimouski —
2010-03-26 587-557 not yet reported which blocks → Fibernetics Corporation 464D Edmonton —
2010-03-26 587-887 not yet reported which blocks → Fibernetics Corporation 464D Calgary —
2010-03-26 613-641 not yet reported which blocks → Bragg Communications Inc. 4878 Williamsburg —
2010-03-26 613-642 not yet reported which blocks → Bragg Communications Inc. 4878 Alexandria —
2010-03-26 613-643 not yet reported which blocks → Bragg Communications Inc. 4878 Morrisburg —
2010-03-26 613-669 not yet reported which blocks → Bragg Communications Inc. 4878 Iroquois —
2010-03-26 647-796 not yet reported which blocks → Managed Network Systems Inc. 2776 Toronto —
2010-03-26 717-205 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 LANCASTER PA
2010-03-26 720-658 not yet reported which blocks → TELSTAR COMMUNICATIONS INC 016G DENVER CO
2010-03-26 912-226 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E SAVANNAH GA
2010-03-26 951-290 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2010-03-25 234-206 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C AKRON OH
2010-03-25 541-632 0–9 XXXall 10 · 6 holders which blocks → ELTOPIA COMMUNICATIONS LLC - OR 647F EUGENE OR
2010-03-25 567-288 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C TOLEDO OH
2010-03-25 614-420 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C COLUMBUS OH
2010-03-25 732-399 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF NEW JERSEY, LLC - NJ 264F BOUNDBROOK NJ
2010-03-25 865-208 0–9 XXXwhole prefix which blocks → POWERTEL NASHVILLE LICENSES, INC. 7476 KNOXVILLE TN
2010-03-25 937-716 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C DAYTON OH
2010-03-25 971-269 0–9 XXXall 10 · 5 holders which blocks → ELTOPIA COMMUNICATIONS LLC - OR 647F PORTLAND OR
2010-03-24 217-271 0–9 XXXall 10 · 5 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F JACKSONVL IL
2010-03-24 318-519 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BLANCHARD LA
2010-03-24 337-476 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SULPHUR LA
2010-03-24 408-320 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C SNJS WEST CA
2010-03-24 702-570 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NV 075F LAS VEGAS NV
2010-03-24 815-800 0–9 XXXall 10 · 6 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F POPLAR GRV IL
2010-03-23 207-661 0–9 XXXwhole prefix which blocks → CRC COMMUNICATIONS OF MAINE, INC. - ME 1255 PORTLAND ME
2010-03-23 217-293 0–9 XXXall 10 · 3 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F MARSHALL IL
2010-03-23 226-500 not yet reported which blocks → Videotron Ltd. 383F Guelph —
2010-03-23 226-600 not yet reported which blocks → Videotron Ltd. 383F Kitchener-Waterloo —
2010-03-23 234-284 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 HUDSON OH
2010-03-23 289-990 not yet reported which blocks → Videotron Ltd. 383F St. Catharines-Thorold —
2010-03-23 319-312 0XXX1XXX · 2 holders which blocks → MCC TELEPHONY LLC 593K DYSART IA
2010-03-23 505-312 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBUQURQUE NM
2010-03-23 505-359 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ALBUQURQUE NM
2010-03-23 618-430 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → MCC TELEPHONY LLC 593K HECKER IL
2010-03-23 618-469 0XXX1XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F ROBINSON IL
2010-03-23 815-884 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → MCC TELEPHONY LLC 593K EARLVILLE IL
2010-03-23 832-459 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2010-03-23 989-308 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LINWOOD MI
2010-03-22 347-314 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 NWYRCYZN06 NY
2010-03-22 845-377 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HIGH FALLS NY
2010-03-22 845-379 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CLINTONCOR NY
2010-03-22 845-393 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E MARLBORO NY
2010-03-19 204-440 not yet reported which blocks → Fido Solutions Inc. 5643 Boissevain —
2010-03-19 204-442 not yet reported which blocks → Fido Solutions Inc. 5643 Gimli —
2010-03-19 204-459 not yet reported which blocks → Fido Solutions Inc. 5643 Lac Du Bonnet —

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.