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
2010-04-26 515-535 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 DES MOINES IA
2010-04-26 581-261 not yet reported which blocks → Bell Canada 984C Matane —
2010-04-26 581-262 not yet reported which blocks → Bell Canada 984C Montmagny —
2010-04-26 587-333 not yet reported which blocks → Iristel Inc. 154E Calgary —
2010-04-26 604-383 not yet reported which blocks → Shaw Telecom Inc. 497E Ladner —
2010-04-26 606-554 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VIRGIE KY
2010-04-26 778-446 not yet reported which blocks → Bragg Communications Inc. 4878 Vancouver —
2010-04-26 845-645 0–9 XXXall 10 · 4 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 MIDDLETOWN NY
2010-04-26 845-648 0–9 XXXall 10 · 7 holders which blocks → FRONTIER COMMUNICATIONS OF AMERICA, INC. - NY 2475 MIDDLETOWN NY
2010-04-23 226-700 not yet reported which blocks → Videotron Ltd. 383F London —
2010-04-23 315-313 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 SYRACUSE NY
2010-04-23 321-710 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 ORLANDO FL
2010-04-23 347-300 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 NWYRCYZN06 NY
2010-04-23 559-530 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HANFORD CA
2010-04-23 647-770 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-04-23 705-500 not yet reported which blocks → Videotron Ltd. 383F Barrie —
2010-04-23 780-591 not yet reported which blocks → Shaw Telecom Inc. 497E Stony Plain —
2010-04-22 207-922 0–9 XXXall 10 · 8 holders which blocks → OXFORD CNTY TELEPHONE SVC CO, DBA OXFORD NETWRKS 5205 BANGOR ME
2010-04-22 217-505 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCC TELEPHONY LLC 593K WARSAW IL
2010-04-22 281-887 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 SATSUMA TX
2010-04-22 385-208 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2010-04-22 618-460 1XXX which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F LOUISVILLE IL
2010-04-22 618-461 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCC TELEPHONY LLC 593K ST ELMO IL
2010-04-22 618-480 1XXX4XXX · 2 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F OBLONG IL
2010-04-22 646-439 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2010-04-22 818-900 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFN GRHL CA
2010-04-21 256-929 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K HUNTSVILLE AL
2010-04-21 321-247 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C ORLANDO FL
2010-04-21 720-439 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-04-21 763-273 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K TWINCITIES MN
2010-04-21 843-751 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHARLESTON SC
2010-04-21 843-865 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C CHERAW SC
2010-04-20 520-441 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2010-04-20 720-426 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 DENVER CO
2010-04-20 910-434 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ROCKINGHAM NC
2010-04-19 214-799 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCKINNEY TX
2010-04-19 812-772 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PERRY-SPENCER COMMUNICATIONS, INC. - IN 5584 TELL CITY IN
2010-04-19 850-705 1XXX6XXX8XXX9XXX · 3 holders which blocks → MCC TELEPHONY OF FLORIDA, LLC - FL 919F PORTST JOE FL
2010-04-16 307-681 not yet reported which blocks → ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY 268A GILLETTE WY
2010-04-16 515-765 1XXX5XXX · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F BANCROFT IA
2010-04-16 623-498 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2010-04-16 801-935 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2010-04-16 859-705 0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM KENTUCKY EAST, INC. - LEXINGTON 9690 LEXINGTON KY
2010-04-15 306-203 not yet reported which blocks → SaskTel Mobility 9868 Saskatoon —
2010-04-15 514-507 not yet reported which blocks → Videotron Ltd. 8306 Montreal —
2010-04-15 574-337 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F SYRACUSE IN
2010-04-15 615-939 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NASHVILLE TN
2010-04-15 709-720 not yet reported which blocks → Bell Mobility Aliant 329A Upper Island Cove —
2010-04-15 709-800 not yet reported which blocks → Iristel Inc. 154E St. John's —
2010-04-15 902-800 not yet reported which blocks → Iristel Inc. 154E Halifax —

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.