NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2010-10-20 309-340 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
2010-10-20 312-477 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2010-10-20 406-305 0XXX1XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WHSLPHRSPG MT
2010-10-20 406-514 0XXX1XXX2XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
2010-10-20 406-956 0XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BAKER MT
2010-10-20 605-551 1XXX5XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRITTON SD
2010-10-20 605-613 0XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLATTE SD
2010-10-20 605-844 4XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLARK SD
2010-10-20 605-927 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SISSETON SD
2010-10-20 613-809 not yet reported which blocks → TELUS Mobility 8303 Ottawa-Hull —
2010-10-20 623-428 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-10-20 647-253 not yet reported which blocks → TELUS Integrated Communications 2782 Toronto —
2010-10-20 705-414 not yet reported which blocks → Distributel 082E Wawa —
2010-10-20 705-419 not yet reported which blocks → Distributel 082E Sudbury —
2010-10-20 719-445 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J COLORDOSPG CO
2010-10-20 720-808 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2010-10-20 780-508 not yet reported which blocks → TELUS 8084 Edmonton —
2010-10-20 780-509 not yet reported which blocks → TELUS 8084 Edmonton —
2010-10-20 780-613 not yet reported which blocks → TELUS 8084 Edmonton —
2010-10-20 803-610 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CLOVER SC
2010-10-20 828-833 not yet reported which blocks → SKYBEST COMMUNICATIONS, INC. - NC 9539 NEWLAND NC
2010-10-19 209-701 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ESCALON CA
2010-10-19 440-481 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2010-10-19 540-728 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2010-10-19 701-551 not yet reported which blocks → ONVOY, LLC - ND 452F FARGO ND
2010-10-19 727-614 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 CLEARWATER FL
2010-10-19 806-442 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 LEVELLAND TX
2010-10-19 985-444 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J LAPLACE LA
2010-10-18 262-624 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NO ANTIOCH WI
2010-10-18 323-396 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2010-10-18 404-883 0–9 XXXall 10 · 3 holders which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 ATLANTA GA
2010-10-18 414-399 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2010-10-18 414-939 0–9 XXXall 10 · 3 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
2010-10-18 414-988 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MILWAUKZN1 WI
2010-10-18 435-322 0XXX2XXX3XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DUCHESNE UT
2010-10-18 470-215 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 NEWNAN GA
2010-10-18 571-528 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2010-10-18 704-390 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHARLOTTE NC
2010-10-18 757-452 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J NRFOLKZON2 VA
2010-10-18 815-240 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ROCK CUT IL
2010-10-18 919-480 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 RALEIGH NC
2010-10-15 256-978 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 SHEFFIELD AL
2010-10-15 289-684 not yet reported which blocks → TELUS Mobility 8303 Hamilton —
2010-10-15 289-685 not yet reported which blocks → TELUS Mobility 8303 Oshawa —
2010-10-15 438-875 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2010-10-15 438-939 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2010-10-15 505-423 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESPANOLA NM
2010-10-15 581-982 not yet reported which blocks → Videotron Ltd. 328F Quebec —
2010-10-15 581-994 not yet reported which blocks → TELUS Mobility 8303 Quebec —
2010-10-15 581-995 not yet reported which blocks → TELUS Mobility 8303 Quebec —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.