NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
— 914-996 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 WSCHSTZN09 NY
— 914-997 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 WSCHSTZN08 NY
— 914-998 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 WSCHSTZN06 NY
— 914-999 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC- NY 384C WSCHSTZN03 NY
— 915-200 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EL PASO TX
— 915-203 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-204 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 915-217 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL PASO TX
— 915-220 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-222 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL PASO TX
— 915-225 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7263 EL PASO TX
— 915-231 0XXX1XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-234 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C EL PASO TX
— 915-240 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-241 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-252 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-253 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-256 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-257 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F EL PASO TX
— 915-261 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL PASO TX
— 915-271 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EL PASO TX
— 915-274 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-275 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 EL PASO TX
— 915-276 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-287 not yet reported which blocks → SPOK, INC. 6630 EL PASO TX
— 915-298 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7263 EL PASO TX
— 915-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 915-313 1XXX2XXX4XXX5XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-322 not yet reported which blocks → TX
— 915-323 not yet reported which blocks → TX
— 915-324 not yet reported which blocks → TX
— 915-326 not yet reported which blocks → TX
— 915-328 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-329 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-336 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C EL PASO TX
— 915-342 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 EL PASO TX
— 915-346 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-351 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-355 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-369 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 SIERRABLNC TX
— 915-373 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-383 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 915-422 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-433 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-434 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-435 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-449 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL PASO TX
— 915-471 7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 EL PASO TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.