NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
2013-11-06 903-435 0–9 XXXall 10 · 2 holders which blocks → PEOPLES COMMUNICATION, INC. -TX 135H BIRTHRIGHT TX
2013-11-06 903-460 0–9 XXXall 10 · 2 holders which blocks → PEOPLES COMMUNICATION, INC. -TX 135H WILLSPOINT TX
2013-11-06 903-558 0–9 XXXall 10 · 2 holders which blocks → PEOPLES COMMUNICATION, INC. -TX 135H SULPHURSPG TX
2013-11-06 903-953 0–9 XXXall 10 · 2 holders which blocks → PEOPLES COMMUNICATION, INC. -TX 135H EMORY TX
2013-11-05 267-686 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PHLDLPHZN4 PA
2013-11-05 267-938 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PHLDLPHZN4 PA
2013-11-05 469-704 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-11-05 512-688 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K GEORGETOWN TX
2013-11-05 513-814 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
2013-11-05 513-815 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CINCINNATI OH
2013-11-05 574-703 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C SOUTH BEND IN
2013-11-05 786-701 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PERRINE FL
2013-11-05 814-972 2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → VERIZON NORTH, INC. - PA 0169 MEYERSDALE PA
2013-11-05 903-630 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K TYLER TX
2013-11-05 903-706 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K PARIS TX
2013-11-05 903-904 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K ATHENS TX
2013-11-05 928-440 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K FLAGSTAFF AZ
2013-11-05 928-733 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-05 936-703 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K CONROE TX
2013-11-05 979-704 0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks → CSC VOICE, LLC 612K BRYAN TX
2013-11-04 417-320 0–9 XXXall 10 · 2 holders which blocks → CSC VOICE, LLC 612K BRANSON MO
2013-11-04 417-494 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K NIXA MO
2013-11-04 442-228 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K BISHOP CA
2013-11-04 505-596 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 ALBUQURQUE NM
2013-11-04 530-536 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K TRUCKEE CA
2013-11-04 660-241 4XXX5XXX which blocks → CSC VOICE, LLC 612K MARYVILLE MO
2013-11-04 707-798 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K EUREKA CA
2013-11-04 740-691 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → CSC VOICE, LLC 612K POMEROY OH
2013-11-04 804-251 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F DISPUTANTA VA
2013-11-04 816-259 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K ST JOSEPH MO
2013-11-04 903-398 0–9 XXXall 10 · 2 holders which blocks → PEOPLES COMMUNICATION, INC. -TX 135H HONEYGROVE TX
2013-11-04 939-223 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 CAROLINA PR
2013-11-04 940-301 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K GAINESVL TX
2013-11-04 940-302 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CSC VOICE, LLC 612K SANGER TX
2013-11-03 781-207 3XXX4XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WALTHAM MA
2013-11-03 781-623 3XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LYNNFIELD MA
2013-11-03 781-634 3XXX4XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NORWOOD MA
2013-11-03 781-723 1XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MEDFORD MA
2013-11-03 781-823 1XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REVERE MA
2013-11-03 978-428 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AYER MA
2013-11-01 206-435 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SEATTLE WA
2013-11-01 226-380 not yet reported which blocks → Bell Mobility 6574 London —
2013-11-01 234-704 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C NORTHFIELD OH
2013-11-01 325-703 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K SAN ANGELO TX
2013-11-01 361-703 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K VICTORIA TX
2013-11-01 432-704 1XXX2XXX3XXX4XXX5XXX which blocks → CSC VOICE, LLC 612K MIDLAND TX
2013-11-01 513-813 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2013-11-01 575-366 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H CLOVIS NM
2013-11-01 579-436 not yet reported which blocks → Videotron Ltd. 8306 Sutton —
2013-11-01 579-437 not yet reported which blocks → Cooptel 818D Eastman —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.