NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
2013-07-17 406-300 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K KALISPELL MT
2013-07-17 515-642 0–9 XXXall 10 · 6 holders which blocks → MINBURN TELEPHONE COMPANY - IA 143H PERRY IA
2013-07-17 581-829 not yet reported which blocks → TELUS Quebec 8083 Baie-Comeau (Hauterive) —
2013-07-17 581-831 not yet reported which blocks → TELUS Quebec 8083 Saint-Georges-de-Beauce —
2013-07-17 587-340 not yet reported which blocks → Bell Mobility 6574 Edmonton —
2013-07-17 587-830 not yet reported which blocks → Bell Mobility 6574 Calgary —
2013-07-17 605-218 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 EAGLEBUTTE SD
2013-07-17 681-315 0–9 XXXall 10 · 5 holders which blocks → DIGITAL CONNECTIONS, INC. - WV 5201 PRKRSBGZN1 WV
2013-07-16 204-552 not yet reported which blocks → Westman Media Cooperative Ltd 120F Boissevain —
2013-07-16 204-554 not yet reported which blocks → Westman Media Cooperative Ltd 120F Killarney —
2013-07-16 240-614 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 WSNGTNZN10 MD
2013-07-16 317-954 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2013-07-16 571-253 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 WSNGTNZN17 VA
2013-07-16 667-206 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 TOWSON MD
2013-07-16 902-573 not yet reported which blocks → Bell Mobility Aliant 329A Country Harbour —
2013-07-16 902-716 not yet reported which blocks → Bell Mobility Aliant 329A Grand Narrows —
2013-07-16 978-553 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUDSON MA
2013-07-15 323-714 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MONTEBELLO CA
2013-07-15 647-518 not yet reported which blocks → Bell Mobility 6574 Toronto —
2013-07-15 709-325 not yet reported which blocks → Bell Mobility Aliant 329A St. John's —
2013-07-15 778-903 not yet reported which blocks → Bell Mobility 6574 Vancouver —
2013-07-15 819-452 not yet reported which blocks → Bell Mobility 6574 Sherbrooke —
2013-07-15 857-267 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MILTON MA
2013-07-12 204-202 not yet reported which blocks → Fibernetics Corporation 464D Winnipeg —
2013-07-12 442-226 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2013-07-12 720-391 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2013-07-12 778-243 not yet reported which blocks → Bell West Inc. 2933 Aldergrove —
2013-07-12 810-212 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 METAMORA MI
2013-07-12 810-221 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G FLINT MI
2013-07-12 818-696 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E GLENDALE CA
2013-07-11 204-691 not yet reported which blocks → Shaw Telecom Inc. 497E Winnipeg —
2013-07-11 204-692 not yet reported which blocks → Shaw Telecom Inc. 497E Portage La Prairie —
2013-07-11 209-292 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2013-07-11 306-952 not yet reported which blocks → Shaw Telecom Inc. 497E Saskatoon —
2013-07-11 306-983 not yet reported which blocks → Shaw Telecom Inc. 497E Moose Jaw —
2013-07-11 352-888 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G GAINESVL FL
2013-07-11 480-207 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2013-07-11 581-827 not yet reported which blocks → TELUS Quebec 8083 Bonaventure —
2013-07-11 581-830 not yet reported which blocks → TELUS Quebec 8083 Sept-Iles —
2013-07-11 581-832 not yet reported which blocks → TELUS Quebec 8083 Gaspe —
2013-07-11 631-658 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K E HAMPTON NY
2013-07-11 631-743 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K PTJEFFERSN NY
2013-07-11 646-693 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
2013-07-11 682-305 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2013-07-11 708-904 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 TINLEYPARK IL
2013-07-10 234-303 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2013-07-10 267-758 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PHLDLPHZN1 PA
2013-07-10 615-626 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NASHVILLE TN
2013-07-10 712-302 0–9 XXXall 10 · 9 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IA 8344 GLENWOOD IA
2013-07-10 763-316 0–9 XXXall 10 · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 TWINCITIES MN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.