NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 475
TON80 COMMUNICATIONS, LLC 17
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
2022-01-27 475-548 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MERIDEN CT
2022-01-27 475-644 2XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GEORGETOWN CT
2022-01-25 475-467 0–9 XXXall 10 · 8 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TRUMBULL CT
2022-01-25 475-639 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J REDDING CT
2022-01-24 475-382 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRANFORD CT
2022-01-18 475-463 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SEYMOUR CT
2022-01-18 475-763 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NAUGATUCK CT
2022-01-17 475-622 0XXX1XXX2XXX3XXX5XXX8XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WOLCOTT CT
2022-01-13 475-327 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MILFORD CT
2022-01-13 475-426 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J RIDGEFIELD CT
2022-01-13 475-466 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MADISON CT
2022-01-13 475-887 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WESTPORT CT
2022-01-10 475-673 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NORWALK CT
2022-01-10 475-832 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WILTON CT
2022-01-07 475-342 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ANSONIDRBY CT
2022-01-07 475-746 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J STAMFORD CT
2020-10-29 475-837 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NEW HAVEN CT

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.