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
2010-04-15 904-546 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 JACKSONVL FL
2010-04-15 913-605 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K GARDNER KS
2010-04-15 913-912 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K KANSASCITY KS
2010-04-14 657-203 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HUNTITNBCH CA
2010-04-14 657-204 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-04-13 269-339 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BATTLE CRK MI
2010-04-13 417-501 0–9 XXXall 10 · 2 holders which blocks → MCC TELEPHONY LLC 593K SPRINGFLD MO
2010-04-13 573-616 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY LLC 593K JEFFERSNCY MO
2010-04-13 618-472 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT VERNON IL
2010-04-13 716-243 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 TONAWANDA NY
2010-04-13 762-436 0–9 XXXwhole prefix which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 COMMERCE GA
2010-04-13 978-751 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 LEOMINSTER MA
2010-04-12 570-580 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J MT POCONO PA
2010-04-12 757-955 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 NRFOLKZON2 VA
2010-04-12 970-600 not yet reported which blocks → TELSTAR COMMUNICATIONS INC 016G WINDSOR CO
2010-04-12 970-745 not yet reported which blocks → UNION TELEPHONE COMPANY 013B GRAND JCT CO
2010-04-12 970-767 not yet reported which blocks → UNION TELEPHONE COMPANY 013B FT COLLINS CO
2010-04-09 226-204 not yet reported which blocks → TELUS Integrated Communications 2782 Preston —
2010-04-09 306-580 not yet reported which blocks → TELUS Mobility 8303 Regina —
2010-04-09 306-850 not yet reported which blocks → TELUS Mobility 8303 Saskatoon —
2010-04-09 406-415 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K DEER LODGE MT
2010-04-09 424-255 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2010-04-09 570-597 0XXX1XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → IDT AMERICA, CORP. - PA 213C MIFFLINBG PA
2010-04-09 647-744 not yet reported which blocks → ISP Telecom Inc. 4727 Toronto —
2010-04-08 201-364 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2010-04-08 214-494 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 FRISCO TX
2010-04-08 323-929 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2010-04-08 646-430 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2010-04-06 234-207 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CANTON OH
2010-04-06 865-345 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K TATE SPG TN
2010-04-05 267-737 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7309 PHLDLPHZN2 PA
2010-04-05 484-258 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 READING PA
2010-04-05 570-505 0–9 XXXall 10 · 8 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 WILLIAMSPT PA
2010-04-05 574-351 not yet reported which blocks → COMCAST IP PHONE, LLC 318J BURROWS IN
2010-04-05 615-588 0–9 XXXall 10 · 7 holders which blocks → ADVANTAGE CELLULAR SYSTEMS, INC. - TN 841F CARTHAGE TN
2010-04-05 623-336 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2010-04-05 713-338 0–9 XXXall 10 · 6 holders which blocks → SOUTHWESTERN BELL 9533 HOUSTON TX
2010-04-05 814-826 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 STATECOLLG PA
2010-04-05 951-291 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ELSINORE CA
2010-04-05 956-665 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 EDINBURG TX
2010-04-02 234-249 0–9 XXXall 10 · 4 holders which blocks → SUPER-NET, INC. - OH 155F WOOSTER OH
2010-04-02 248-795 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2010-04-02 256-979 0–9 XXXall 10 · 5 holders which blocks → FARMERS TELECOMMUNICATIONS CORPORATION - AL 947D FORT PAYNE AL
2010-04-02 313-462 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C DETROITZN1 MI
2010-04-02 505-393 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WHITE ROCK NM
2010-04-02 505-427 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 FARMINGTON NM
2010-04-02 517-366 0–9 XXXall 10 · 7 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2010-04-02 517-489 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C LANSING MI
2010-04-02 616-965 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C GRAND RPDS MI
2010-04-02 720-509 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO

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.