NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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 — NPA 737
8X8, INC. 1
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2013-10-23 737-210 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2013-08-13 737-222 0–9 XXXall 10 · 5 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D AUSTIN TX
2013-07-23 737-346 0–9 XXXall 10 · 5 holders which blocks → AUSTIN BESTLINE COMPANY 7551 AUSTIN TX
2013-03-04 737-444 0–9 XXXall 10 · 5 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D GEORGETOWN TX
2013-03-04 737-666 0–9 XXXall 10 · 9 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D ELGIN TX
2013-03-04 737-888 0–9 XXXall 10 · 7 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D TAYLOR TX
2013-03-04 737-999 0–9 XXXall 10 · 6 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D BUDA TX
2013-03-01 737-333 0–9 XXXall 10 · 3 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D AUSTIN TX
2013-02-19 737-777 0–9 XXXall 10 · 5 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D LEANDER TX
— 737-205 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-218 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F AUSTIN TX
— 737-225 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 ROCKDALE TX
— 737-242 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
— 737-243 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F AUSTIN TX
— 737-247 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-271 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C DRIPPNGSPG TX
— 737-304 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H AUSTIN TX
— 737-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-322 0XXX1XXX2XXX3XXX7XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ADAMSVILLE TX
— 737-337 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C FENTRESS TX
— 737-353 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J BUDA TX
— 737-372 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - TX 903C BUCHANNDAM TX
— 737-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-437 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - TX 903C THORNDTHRL TX
— 737-443 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AUSTIN TX
— 737-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-537 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - TX 903C LAMPASAS TX
— 737-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 737-610 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-615 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-700 not yet reported which blocks → TX
— 737-703 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-708 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 AUSTIN TX
— 737-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-734 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - TX 903C LIBERTY HL TX
— 737-773 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - TX 903C JARRELL TX
— 737-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-830 not yet reported which blocks → TX
— 737-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 737-932 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 737-950 not yet reported which blocks → TX
— 737-958 not yet reported which blocks → TX
— 737-959 not yet reported which blocks → TX
— 737-976 not yet reported which blocks → TX

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.