NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
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
2015-07-24 951-420 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2015-07-23 313-398 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2015-07-23 360-505 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J GRAYHARBCO WA
2015-07-23 480-757 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2015-07-23 502-953 0–9 XXXall 10 · 4 holders which blocks → POWERTEL KENTUCKY LICENSES, INC. 365C LOUISVILLE KY
2015-07-23 505-544 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2015-07-23 516-494 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C NASSAUZN09 NY
2015-07-23 520-719 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2015-07-23 586-333 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C MT CLEMENS MI
2015-07-23 619-484 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2015-07-23 667-770 0–9 XXXall 10 · 4 holders which blocks → AIRUS, INC. - MD 691H BALTIMORE MD
2015-07-23 762-685 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J AUGUSTA GA
2015-07-23 810-498 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDBLANC MI
2015-07-23 816-207 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 LEESSUMMIT MO
2015-07-22 317-749 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F INDIANAPLS IN
2015-07-22 587-761 not yet reported which blocks → Comwave Networks 160G Morinville —
2015-07-22 587-918 not yet reported which blocks → Comwave Networks 160G Spruce Grove —
2015-07-22 609-855 0–9 XXXall 10 · 5 holders which blocks → XO NEW JERSEY, INC. 4123 ATLNTIC CY NJ
2015-07-22 647-549 not yet reported which blocks → Bell Mobility 6574 Toronto —
2015-07-22 647-900 not yet reported which blocks → InnSysVoice Corp 383H Toronto —
2015-07-22 781-703 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 WALTHAM MA
2015-07-22 814-961 0–9 XXXall 10 · 7 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 JOHNSTOWN PA
2015-07-22 819-927 not yet reported which blocks → Comwave Networks 160G Magog —
2015-07-22 857-331 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2015-07-21 210-941 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2015-07-21 248-897 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E PONTIAC MI
2015-07-21 312-358 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-07-21 317-389 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
2015-07-21 405-968 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
2015-07-21 629-202 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 7977 NASHVILLE TN
2015-07-21 720-990 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2015-07-21 763-406 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MN 184D TWINCITIES MN
2015-07-21 830-410 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 HONDO TX
2015-07-21 872-315 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2015-07-21 872-904 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2015-07-21 929-280 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN04 NY
2015-07-21 929-340 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN07 NY
2015-07-21 929-391 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN09 NY
2015-07-21 929-393 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN10 NY
2015-07-21 937-951 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2015-07-21 956-615 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LAREDO TX
2015-07-20 331-321 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2015-07-20 343-214 not yet reported which blocks → TELUS Integrated Communications 2782 Manotick —
2015-07-20 469-913 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2015-07-20 506-201 not yet reported which blocks → TELUS Integrated Communications 2782 Caraquet —
2015-07-20 530-395 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E REDDING CA
2015-07-20 551-229 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 JERSEYCITY NJ
2015-07-20 587-459 not yet reported which blocks → TELUS 8084 Edmonton —
2015-07-20 619-380 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
2015-07-20 747-272 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GLENDALE CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.