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 978
BANDWIDTH.COM CLEC, LLC - MA 32
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
2011-03-18 978-403 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LUNENBURG MA
2005-06-09 978-822 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E SHIRLEY MA
2001-07-20 978-216 1XXX5XXX6XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BOLTON MA
— 978-205 1XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WILMINGTON MA
— 978-209 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E SUDBURY MA
— 978-245 9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-261 0XXX1XXX2XXX3XXX5XXX7XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E SUDBURY MA
— 978-267 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WILMINGTON MA
— 978-272 1XXX6XXX7XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E GROTON MA
— 978-295 1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E SUDBURY MA
— 978-393 1XXX5XXX6XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E ACTON MA
— 978-444 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WILMINGTON MA
— 978-472 2XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-488 4XXX7XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-545 2XXX3XXX5XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-547 5XXX7XXX8XXX9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-572 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E NEWBURYPT MA
— 978-576 5XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-585 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-591 5XXX6XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-593 1XXX5XXX6XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E ATHOLFKLN MA
— 978-622 2XXX5XXX6XXX7XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-629 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-674 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LOWELL MA
— 978-680 3XXX5XXX8XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-706 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CLINTON MA
— 978-734 2XXX3XXX4XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-786 1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEOMINSTER MA
— 978-803 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-859 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-924 4XXX6XXX8XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WILMINGTON MA
— 978-958 1XXX6XXX7XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E GARDNER MA

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.