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
2011-05-24 407-274 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 WINTERPARK FL
2011-05-24 604-401 not yet reported which blocks → Videotron Ltd. 383F Vancouver —
2011-05-24 604-445 not yet reported which blocks → Videotron Ltd. 383F Vancouver —
2011-05-24 778-451 not yet reported which blocks → TELUS 8086 Courtenay —
2011-05-24 830-282 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F DEL RIO TX
2011-05-24 857-259 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2011-05-24 985-238 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C PINE LA
2011-05-24 985-261 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ANGIE LA
2011-05-23 224-880 0–9 XXXall 10 · 7 holders which blocks → ILLINOIS BELL TEL CO 9329 LAKEFOREST IL
2011-05-23 313-757 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2011-05-23 314-717 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KIRKWOOD MO
2011-05-23 385-200 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SPANIHFORK UT
2011-05-23 385-244 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F OGDEN UT
2011-05-23 402-818 0–9 XXXwhole prefix which blocks → WINDSTREAM COMMUNICATIONS OF THE MIDEWEST INC - NE 7816 OMAHA NE
2011-05-23 402-915 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E OMAHA NE
2011-05-23 575-689 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
2011-05-23 618-230 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 EDGEMONT IL
2011-05-23 646-570 0–9 XXXall 10 · 2 holders which blocks → TELENGY L.L.C. - NY 473G NWYRCYZN01 NY
2011-05-23 731-227 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PARIS TN
2011-05-20 226-348 not yet reported which blocks → TELUS Mobility 8303 Windsor —
2011-05-20 226-627 not yet reported which blocks → TELUS Mobility 8303 Chatham —
2011-05-20 507-576 none assigned yet which blocks → ONVOY, LLC - MN 184D KILKENNY MN
2011-05-20 518-544 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SUMMIT NY
2011-05-20 587-277 not yet reported which blocks → TELUS Mobility 8301 Drayton Valley —
2011-05-20 607-332 2XXX3XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PULTENEY NY
2011-05-20 646-531 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2011-05-20 773-666 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN04 IL
2011-05-20 778-267 not yet reported which blocks → TELUS Mobility 8301 Williams Lake —
2011-05-20 816-839 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 KANSASCITY MO
2011-05-20 862-230 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 NEWARK NJ
2011-05-20 913-230 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 KANSASCITY KS
2011-05-20 980-272 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 CHARLOTTE NC
2011-05-18 202-599 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - DC 074F WSHNGTNZN1 DC
2011-05-18 203-997 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2011-05-18 215-999 0–9 XXXall 10 · 3 holders which blocks → XTEL COMMUNICATIONS, INC. 854D PHLDLPHZN1 PA
2011-05-18 432-223 0–9 XXXall 10 · 7 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 ANDREWS TX
2011-05-18 450-529 not yet reported which blocks → ISP Telecom Inc. 4727 St-Jean —
2011-05-18 469-265 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2011-05-18 478-419 0–9 XXXall 10 · 6 holders which blocks → PINELAND COMMUNICATIONS, INC. - GA 458G SWAINSBORO GA
2011-05-18 512-348 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2011-05-18 575-455 1XXX5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MORA NM
2011-05-18 604-336 not yet reported which blocks → Shaw Telecom Inc. 497E Vancouver —
2011-05-18 708-495 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 LA GRANGE IL
2011-05-18 720-441 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2011-05-18 778-603 not yet reported which blocks → Bell West Inc. 2933 Powell River —
2011-05-18 872-220 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2011-05-18 902-322 not yet reported which blocks → TELUS Mobility 8303 Sydney —
2011-05-18 908-300 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 SOMERVILLE NJ
2011-05-17 202-578 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DC 6402 WSHNGTNZN1 DC
2011-05-17 347-971 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN06 NY

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.