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
2012-03-23 415-603 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2012-03-23 579-987 not yet reported which blocks → Iristel Inc. 154E Ste-Therese —
2012-03-23 579-990 not yet reported which blocks → Iristel Inc. 154E St-Jerome —
2012-03-22 204-505 not yet reported which blocks → Shaw Telecom Inc. 497E Winnipeg —
2012-03-22 226-526 not yet reported which blocks → Fibernetics Corporation 464D Windsor —
2012-03-22 240-734 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F SMITHSBURG MD
2012-03-22 249-888 not yet reported which blocks → Fibernetics Corporation 464D Barrie —
2012-03-22 289-903 not yet reported which blocks → Iristel Inc. 154E Newmarket —
2012-03-22 289-917 not yet reported which blocks → Iristel Inc. 154E Maple —
2012-03-22 320-316 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MN 184D ST CLOUD MN
2012-03-22 343-884 not yet reported which blocks → Fibernetics Corporation 464D Kingston —
2012-03-22 407-205 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E ORLANDO FL
2012-03-22 415-590 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2012-03-22 470-554 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF GEORGIA, LLC - GA 909E ATLANTA NE GA
2012-03-22 470-809 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF GEORGIA, LLC - GA 909E ATLANTA GA
2012-03-22 509-491 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KENNEWICK WA
2012-03-22 581-309 not yet reported which blocks → Bell Mobility 6574 Quebec —
2012-03-22 581-337 not yet reported which blocks → Bell Mobility 6574 Riviere-du-Loup —
2012-03-22 581-704 not yet reported which blocks → Iristel Inc. 154E Quebec —
2012-03-22 587-437 not yet reported which blocks → Bell Mobility 6574 Calgary —
2012-03-22 604-337 not yet reported which blocks → Iristel Inc. 154E Richmond —
2012-03-22 619-354 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG SNDG CA
2012-03-22 707-388 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C ARCATA CA
2012-03-22 816-466 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J OAK GROVE MO
2012-03-22 819-414 not yet reported which blocks → Iristel Inc. 154E Ottawa-Hull —
2012-03-22 902-398 not yet reported which blocks → Bell Mobility Aliant 329A New Germany —
2012-03-22 917-819 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K NWYRCYZN03 NY
2012-03-22 989-368 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E HARRISON MI
2012-03-21 289-498 not yet reported which blocks → Fibernetics Corporation 464D Brampton —
2012-03-21 289-904 not yet reported which blocks → Iristel Inc. 154E Malton —
2012-03-21 289-907 not yet reported which blocks → Iristel Inc. 154E King City —
2012-03-21 352-501 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → CENTURYLINK OF FLORIDA, INC. (UNITED) 0341 CRYSTALRIV FL
2012-03-21 361-447 not yet reported which blocks → VTX COMMUNICATIONS, LLC 776A GEORGEWEST TX
2012-03-21 361-784 not yet reported which blocks → VTX COMMUNICATIONS, LLC 776A THREERIVRS TX
2012-03-21 579-500 not yet reported which blocks → Iristel Inc. 154E Joliette —
2012-03-21 579-800 not yet reported which blocks → Iristel Inc. 154E Laprairie —
2012-03-21 612-315 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MINNESOTA, LLC - MN 107F TWINCITIES MN
2012-03-21 613-519 not yet reported which blocks → Iristel Inc. 154E Kanata-Stittsville —
2012-03-21 614-981 0–9 XXXall 10 · 2 holders which blocks → CITYNET OHIO, LLC - OH 036B COLUMBUS OH
2012-03-21 651-409 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MINNESOTA, LLC - MN 107F SCANDIMRIN MN
2012-03-21 778-450 not yet reported which blocks → TELUS 8086 Cranbrook —
2012-03-21 902-705 not yet reported which blocks → Iristel Inc. 154E Halifax —
2012-03-20 343-882 not yet reported which blocks → Fibernetics Corporation 464D Ottawa-Hull —
2012-03-20 438-738 not yet reported which blocks → Fibernetics Corporation 464D Montreal —
2012-03-20 438-818 not yet reported which blocks → Fibernetics Corporation 464D Ste-Genevieve —
2012-03-20 438-819 not yet reported which blocks → Fibernetics Corporation 464D Lachine —
2012-03-20 450-497 not yet reported which blocks → Iristel Inc. 154E Chomedey —
2012-03-20 581-681 not yet reported which blocks → Fibernetics Corporation 464D Quebec —
2012-03-20 587-409 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2012-03-20 587-410 not yet reported which blocks → Iristel Inc. 154E Edmonton —

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.