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

BANDWIDTH.COM CLEC, LLC - CT 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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2021-11-18	475-310	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	WALLINGFD	CT
2021-09-29	475-315	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	CHESHIRE	CT
2021-09-27	475-297	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	NEWTOWN	CT
2021-08-31	475-290	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	DANBURY	CT
2020-07-15	475-274	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	GUILFORD	CT
2020-07-15	475-285	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	NAUGATUCK	CT
2020-06-22	475-273	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	BRIDGEPORT	CT
2020-02-05	475-265	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	TRUMBULL	CT
2019-05-23	475-262	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	HUNTINGTON	CT
2015-04-23	475-522	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	MADISON	CT
2015-04-23	475-549	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	MILFORD	CT
2015-04-23	475-558	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	NEW CANAAN	CT
2015-04-16	475-219	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	WOLCOTT	CT
2014-12-01	475-325	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	GEORGETOWN	CT
2014-08-15	475-221	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	BRANFORD	CT
2014-03-25	475-329	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	DANBURY	CT
2013-01-30	475-675	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	SEYMOUR	CT
2011-08-29	475-282	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	BRIDGEPORT	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.