NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2010-09-20 615-601 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F NASHVILLE TN
2010-09-17 234-414 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C CANFIELD OH
2010-09-17 254-273 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C BARTLETT TX
2010-09-17 309-435 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C CANTON IL
2010-09-17 317-550 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F INDIANAPLS IN
2010-09-17 430-625 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C LONGVIEW TX
2010-09-17 516-340 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E COLDSPGHBR NY
2010-09-17 530-487 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C CHICO CA
2010-09-17 585-337 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CANANDAGUA NY
2010-09-17 626-560 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ALHAMBRA CA
2010-09-17 646-480 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
2010-09-17 812-646 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C BOONVILLE IN
2010-09-17 813-520 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 TAMPACEN FL
2010-09-17 956-274 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C DONNA TX
2010-09-16 518-318 0–9 XXXall 10 · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 CAIRO NY
2010-09-16 585-326 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E AKRON NY
2010-09-16 778-482 not yet reported which blocks → Shaw Telecom Inc. 497E 100 Mile House —
2010-09-16 845-241 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HAVERSTRAW NY
2010-09-15 276-433 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 7 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - VA 4979 RICHLANDS VA
2010-09-15 312-227 0–9 XXXwhole prefix which blocks → ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2010-09-15 385-232 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2010-09-15 530-801 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 CHICO CA
2010-09-15 720-445 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-15 872-888 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2010-09-15 931-313 0–9 XXXall 10 · 6 holders which blocks → AENEAS COMMUNICATIONS, LLC - TN 2891 WINCHESTER TN
2010-09-14 204-597 not yet reported which blocks → Shaw Telecom Inc. 497E Elie —
2010-09-14 347-447 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 NWYRCYZN08 NY
2010-09-14 347-501 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN03 NY
2010-09-14 347-502 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN11 NY
2010-09-14 615-924 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NASHVILLE TN
2010-09-14 646-477 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2010-09-14 647-799 not yet reported which blocks → Iristel Inc. 154E Toronto —
2010-09-14 647-920 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Toronto —
2010-09-14 647-921 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Toronto —
2010-09-14 647-960 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Toronto —
2010-09-14 647-961 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Toronto —
2010-09-14 681-201 0–9 XXXall 10 · 4 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - WV 489F WELCH WV
2010-09-14 705-491 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 North Bay —
2010-09-14 717-819 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 YORK PA
2010-09-14 769-486 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DE KALB MS
2010-09-14 813-444 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E TAMPACEN FL
2010-09-14 872-777 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN07 IL
2010-09-14 915-249 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL PASO TX
2010-09-14 940-268 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DENTON TX
2010-09-13 201-771 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J DUMONT NJ
2010-09-13 289-927 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Oshawa —
2010-09-13 313-829 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
2010-09-13 313-953 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
2010-09-13 438-876 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2010-09-13 573-539 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VERSAILLES MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.