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
2004-06-09 850-299 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 GRACEVILLE FL
2004-06-09 850-364 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 HAVANA FL
2004-06-09 856-726 0–9 XXXall 10 · 4 holders which blocks → NETCARRIER TELECOM, INC. - NJ 9003 CAMDEN NJ
2004-06-09 904-201 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 ST JOHNS FL
2004-06-09 910-516 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC 7835 CHADBOURN NC
2004-06-09 918-602 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COLLINSVL OK
2004-06-08 320-338 3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 GRANITEFLS MN
2004-06-08 520-686 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BENSON AZ
2004-06-08 601-348 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MS 5178 PURVIS MS
2004-06-08 601-385 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MS 5178 WIGGINS MS
2004-06-08 601-790 0–9 XXXall 10 · 9 holders which blocks → TEC OF JACKSON, INC. - MS 3704 MADISON MS
2004-06-08 662-471 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ASHLAND MS
2004-06-08 770-573 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - GA 6116 VILLA RICA GA
2004-06-08 845-694 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SPRING VLY NY
2004-06-08 903-289 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KEMP TX
2004-06-08 918-790 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F SALLISAW OK
2004-06-07 302-338 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2004-06-07 302-340 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DELAWARECY DE
2004-06-07 302-341 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2004-06-07 302-361 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOCKESSIN DE
2004-06-07 302-370 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEW CASTLE DE
2004-06-07 302-371 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOLLY OAK DE
2004-06-07 302-372 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOCKESSIN DE
2004-06-07 302-374 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOLLY OAK DE
2004-06-07 302-380 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DELAWARECY DE
2004-06-07 705-309 not yet reported which blocks → TELUS Mobility 8303 Barrie —
2004-06-07 719-244 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COLORDOSPG CO
2004-06-07 905-746 not yet reported which blocks → TELUS Mobility 8303 Hamilton —
2004-06-04 224-238 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2004-06-04 409-209 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KOUNTZE TX
2004-06-04 817-549 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON TX
2004-06-04 817-582 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ATLAS TX
2004-06-03 336-429 0–9 XXXall 10 · 4 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 MOUNT AIRY NC
2004-06-03 845-672 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K PORTJERVIS NY
2004-06-03 865-224 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → UNITED STATES CELLULAR - TN 6278 KINGSTON TN
2004-06-03 904-200 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 JACKSONVL FL
2004-06-03 979-210 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 HEARNE TX
2004-06-03 979-273 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 FAYETTEVL TX
2004-06-03 979-284 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 HIGH HILL TX
2004-06-03 979-287 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 CALVERT TX
2004-06-03 979-293 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 CALDWELL TX
2004-06-03 979-294 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 BORDEN TX
2004-06-03 979-295 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 PLUM TX
2004-06-03 979-296 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 WARRENTON TX
2004-06-03 979-298 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 NORTHRUP TX
2004-06-03 979-301 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 KURTEN TX
2004-06-03 979-302 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 MORAVIA TX
2004-06-03 979-303 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 SCHULENBG TX
2004-06-03 979-305 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 DIME BOX TX
2004-06-03 979-306 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 HOSTYN TX

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.