NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2016-08-26 939-231 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 BAYAMONNOR PR
2016-08-25 240-877 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D FREDERICK MD
2016-08-25 504-612 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - LA 153F LAFITTE LA
2016-08-25 510-726 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CROCKETT CA
2016-08-25 559-216 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRESNO CA
2016-08-25 579-473 not yet reported which blocks → ISP Telecom Inc. 4727 Rawdon —
2016-08-25 581-478 not yet reported which blocks → ISP Telecom Inc. 4727 Dolbeau —
2016-08-25 587-734 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Grande Cache —
2016-08-25 614-639 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBUS OH
2016-08-25 618-716 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC 224C TRENTON IL
2016-08-25 702-695 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2016-08-25 873-480 not yet reported which blocks → ISP Telecom Inc. 4727 Labelle —
2016-08-25 951-416 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MIRA LOMA CA
2016-08-25 951-494 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 IDYLLWILD CA
2016-08-25 985-323 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 AMITE CITY LA
2016-08-24 513-597 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTONSVL OH
2016-08-24 614-974 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBLIN OH
2016-08-24 618-801 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C GRANITE CY IL
2016-08-24 618-804 0XXX1XXX2XXX4XXX6XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 LAWRENCEVL IL
2016-08-24 618-961 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C GLENCARBON IL
2016-08-23 240-860 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G CUMBERLAND MD
2016-08-23 267-691 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - PA 002F PHLDLPHZN4 PA
2016-08-23 272-295 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF PENNSYLVANIA, LLC - PA 967E BLOOMSBURG PA
2016-08-23 331-707 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2016-08-23 407-821 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 WINTERPARK FL
2016-08-23 407-853 0–9 XXXall 10 · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 WINTERPARK FL
2016-08-23 407-866 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ORLANDO FL
2016-08-23 423-812 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F GREENEVL TN
2016-08-23 470-348 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CARTERSVL GA
2016-08-23 516-534 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NASSAUZN05 NY
2016-08-23 540-401 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G BERRYVILLE VA
2016-08-23 573-920 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E ELDON MO
2016-08-23 608-460 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUK CITY WI
2016-08-23 628-254 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2016-08-23 667-808 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G EASTON MD
2016-08-23 669-268 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CAMPBELL CA
2016-08-23 682-812 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2016-08-23 719-308 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLORDOSPG CO
2016-08-23 720-546 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-08-23 720-787 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 DENVER CO
2016-08-23 720-919 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-08-23 754-812 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C CORAL SPG FL
2016-08-23 941-303 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 VENICE FL
2016-08-22 270-291 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - KY 8406 CADIZ KY
2016-08-22 405-776 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F EL RENO OK
2016-08-22 442-208 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CALIPATRIA CA
2016-08-22 628-217 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2016-08-22 628-244 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BELVEDERE CA
2016-08-22 646-967 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2016-08-22 682-615 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SPRINGTOWN TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.