NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 15
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
2004-07-29 320-733 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 LITTLE FLS MN
2004-07-29 330-778 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SUPER-NET, INC. - OH 155F APPLECREEK OH
2004-07-29 403-351 not yet reported which blocks → Zayo Canada Inc. 8304 Calgary —
2004-07-29 450-506 not yet reported which blocks → Zayo Canada Inc. 8304 Chomedey —
2004-07-29 519-231 not yet reported which blocks → Zayo Canada Inc. 8304 Galt —
2004-07-29 519-248 not yet reported which blocks → Zayo Canada Inc. 8304 Hespeler —
2004-07-29 540-204 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROANOKE VA
2004-07-29 608-407 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DODGEVILLE WI
2004-07-29 613-383 not yet reported which blocks → Zayo Canada Inc. 8304 Kanata-Stittsville —
2004-07-29 780-229 not yet reported which blocks → Zayo Canada Inc. 8304 Edmonton —
2004-07-29 819-965 not yet reported which blocks → Zayo Canada Inc. 8304 Ottawa-Hull —
2004-07-29 902-334 not yet reported which blocks → Zayo Canada Inc. 8304 Halifax —
2004-07-29 905-247 not yet reported which blocks → Zayo Canada Inc. 8304 Cooksville —
2004-07-29 905-291 not yet reported which blocks → Zayo Canada Inc. 8304 Brampton —
2004-07-29 905-538 not yet reported which blocks → Zayo Canada Inc. 8304 Hamilton —
2004-07-29 913-400 1XXX2XXX3XXX · 2 holders which blocks → MIDCONTINENT COMMUNICATIONS - KS 995H KANSASCITY KS
2004-07-29 913-417 0–9 XXXall 10 · 4 holders which blocks → MIDCONTINENT COMMUNICATIONS - KS 995H TONGANOXIE KS
2004-07-29 913-955 1XXX2XXX3XXX · 2 holders which blocks → MIDCONTINENT COMMUNICATIONS - KS 995H BONNER SPG KS
2004-07-28 254-595 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 STRAWN TX
2004-07-28 514-902 not yet reported which blocks → Videotron Ltd. 8306 Ile-Perrot —
2004-07-28 603-707 0–9 XXXall 10 · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 MEREDITH NH
2004-07-28 757-201 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA 7238 NRFOLKZON2 VA
2004-07-27 207-407 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J LISBON FLS ME
2004-07-27 224-612 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2004-07-27 240-405 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J FREDERICK MD
2004-07-27 240-478 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
2004-07-27 406-371 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BILLINGS MT
2004-07-27 406-437 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HELENA MT
2004-07-27 443-378 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2004-07-27 630-991 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DOWNERSGRV IL
2004-07-27 651-212 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 RED WING MN
2004-07-27 701-552 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FARGO ND
2004-07-27 773-688 0–9 XXXall 10 · 3 holders which blocks → RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN05 IL
2004-07-27 815-450 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MOMENCE IL
2004-07-27 973-968 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J PATERSON NJ
2004-07-26 254-315 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WACO TX
2004-07-26 254-319 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KILLEEN TX
2004-07-26 570-250 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWANDA PA
2004-07-26 570-750 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAPORTE PA
2004-07-26 817-899 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2004-07-26 832-310 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HSTNSUBURB TX
2004-07-26 903-390 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FAIRFIELD TX
2004-07-26 903-806 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LONGVIEW TX
2004-07-26 936-240 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUFKIN TX
2004-07-26 972-951 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IRVING TX
2004-07-25 585-297 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
2004-07-23 615-581 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J WHITEHOUSE TN
2004-07-23 845-632 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K WAPIGRSFLS NY
2004-07-23 850-340 2XXX3XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 PORTST JOE FL
2004-07-23 912-290 0–9 XXXall 10 · 6 holders which blocks → SOUTHERN COMMUNICATIONS SERVICES, INC. 6744 CLAXTON GA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.