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
2013-03-15 785-414 0–9 XXXall 10 · 9 holders which blocks → NUSO, LLC 551G TOPEKA KS
2013-03-15 816-266 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 KANSASCITY MO
2013-03-15 863-417 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E FROSTPROOF FL
2013-03-15 919-907 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NC 8389 DURHAM NC
2013-03-15 928-298 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PIMA AZ
2013-03-15 929-227 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NWYRCYZN03 NY
2013-03-14 217-610 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 551G SPRINGFLD IL
2013-03-14 480-589 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2013-03-14 480-622 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2013-03-14 520-268 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2013-03-14 863-337 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E LAKELAND FL
2013-03-13 309-209 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 551G MACOMB IL
2013-03-13 309-307 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → NUSO, LLC 551G BLOOMINGTN IL
2013-03-13 309-308 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 551G PEORIA IL
2013-03-13 365-266 not yet reported which blocks → Comwave Networks 160G Bradford —
2013-03-13 365-540 not yet reported which blocks → Comwave Networks 160G Tottenham —
2013-03-13 437-836 not yet reported which blocks → Zayo Canada Inc. 8304 Toronto —
2013-03-13 469-510 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GRANDPRARI TX
2013-03-13 515-357 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 AMES IA
2013-03-13 563-316 0–9 XXXall 10 · 7 holders which blocks → CS TECHNOLOGIES, INC. - IA 204A MUSCATINE IA
2013-03-13 618-605 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G CARBONDALE IL
2013-03-13 705-467 not yet reported which blocks → Comwave Networks 160G Collingwood —
2013-03-13 705-502 not yet reported which blocks → Comwave Networks 160G Alliston —
2013-03-13 705-714 not yet reported which blocks → Comwave Networks 160G Brechin —
2013-03-13 705-916 not yet reported which blocks → Comwave Networks 160G Cookstown —
2013-03-13 779-212 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G DE KALB IL
2013-03-13 815-491 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G ROCKFORD IL
2013-03-13 832-909 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX
2013-03-13 832-910 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 HOUSTON TX
2013-03-13 857-304 0–9 XXXall 10 · 7 holders which blocks → TC SYSTEMS, INC. 7135 WATERTOWN MA
2013-03-13 919-391 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E CHAPELHILL NC
2013-03-13 970-415 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 GREELEY CO
2013-03-12 626-986 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LA PUENTE CA
2013-03-12 657-845 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2013-03-12 661-482 4XXX which blocks → TWC IP ENABLED SERVICES, LLC 793K EDWARDS CA
2013-03-12 661-941 0–9 XXXall 10 · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2013-03-12 760-818 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BARSTOW CA
2013-03-12 858-263 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LA JOLLA CA
2013-03-12 864-518 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 GREENVILLE SC
2013-03-12 915-212 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7263 EL PASO TX
2013-03-12 919-717 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 DURHAM NC
2013-03-12 951-923 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HEMT HMLD CA
2013-03-12 956-406 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F HARLINGEN TX
2013-03-12 979-213 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G BRYAN TX
2013-03-11 210-585 0–9 XXXall 10 · 4 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
2013-03-11 240-608 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G FREDERICK MD
2013-03-11 313-209 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN1 MI
2013-03-11 404-450 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA GA
2013-03-11 404-980 0–9 XXXwhole prefix which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 ATLANTA GA
2013-03-11 423-430 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G JOHNSON CY TN

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.