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
2004-08-20 845-697 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CSC VOICE, LLC 612K SLATE HILL NY
2004-08-20 845-713 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K WALDEN NY
2004-08-20 845-769 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K MONTGOMERY NY
2004-08-20 845-773 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → CSC VOICE, LLC 612K STAATSBURG NY
2004-08-20 845-827 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K HIGHLANDML NY
2004-08-20 845-835 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K RED HOOK NY
2004-08-20 845-851 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CSC VOICE, LLC 612K WALLKILL NY
2004-08-20 845-981 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC VOICE, LLC 612K PINEISLAND NY
2004-08-20 850-370 0–9 XXXall 10 · 3 holders which blocks → POWERTEL JACKSONVILLE LICENSES, INC. 7472 APALCHICOL FL
2004-08-20 908-563 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW JERSEY, INC. 9206 MILLINGTON NJ
2004-08-19 308-217 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LEXINGTON NE
2004-08-19 330-312 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CANTON OH
2004-08-19 585-413 0–9 XXXall 10 · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2004-08-19 607-207 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7650 ELMIRA NY
2004-08-19 620-264 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LARNED KS
2004-08-19 620-588 not yet reported which blocks → H & B CABLE SERVICE, INC. - KS 300C CLAFLIN KS
2004-08-19 845-674 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7650 NEWBURGH NY
2004-08-19 865-940 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J DANDRIDGE TN
2004-08-19 928-322 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
2004-08-19 928-377 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KINGMAN AZ
2004-08-18 215-200 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PHLDLPHZN1 PA
2004-08-18 229-214 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CUTHBERT GA
2004-08-18 361-488 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KINGSVILLE TX
2004-08-18 432-599 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MIDLAND TX
2004-08-18 510-948 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HRCUL-RODE CA
2004-08-18 603-703 0–9 XXXall 10 · 2 holders which blocks → OTEL TELEKOM, INC. - NH 9827 MANCHESTER NH
2004-08-18 706-200 0–9 XXXall 10 · 8 holders which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 CLEVELAND GA
2004-08-18 706-300 0–9 XXXall 10 · 3 holders which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 DAHLONEGA GA
2004-08-18 805-617 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANBARBARA CA
2004-08-17 419-567 0–9 XXXall 10 · 9 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 PAULDING OH
2004-08-17 419-632 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 MANSFIELD OH
2004-08-17 603-709 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PLAINFIELD NH
2004-08-17 631-709 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WATER MILL NY
2004-08-17 631-876 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SOUTHOLD NY
2004-08-17 641-204 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 PELLA IA
2004-08-17 703-571 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2004-08-17 732-912 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODBRIDGE NJ
2004-08-17 808-203 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 TELECOM OF HAWAII, LP - HI 8297 HONOLULU HI
2004-08-17 865-745 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J MAYNARDVL TN
2004-08-17 918-325 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 MIAMI OK
2004-08-17 931-787 0–9 XXXall 10 · 2 holders which blocks → BEN LOMAND COMMUNICATIONS, INC. 4586 CROSSVILLE TN
2004-08-16 203-844 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 7230 FAIRFIELD CT
2004-08-16 413-347 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 PITTSFIELD MA
2004-08-16 508-812 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NO SWANSEA MA
2004-08-16 508-859 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LEICESTER MA
2004-08-16 609-431 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 ATLNTIC CY NJ
2004-08-16 703-466 0–9 XXXall 10 · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
2004-08-16 715-977 6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 HAMMOND WI
2004-08-16 786-308 0–9 XXXall 10 · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 MIAMI FL
2004-08-16 787-955 0–9 XXXwhole prefix which blocks → LIBERTY MOBILE PUERTO RICO INC. 639J CAGUAS PR

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.