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
TC SYSTEMS, INC. 39
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
2016-01-29 978-955 0–9 XXXall 10 · 5 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
2011-09-07 978-942 0–9 XXXall 10 · 4 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-218 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 SUDBURY MA
— 978-226 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 TYNGSBORO MA
— 978-227 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 LEOMINSTER MA
— 978-241 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 HAVERHILL MA
— 978-310 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 HUDSON MA
— 978-313 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BILLERICA MA
— 978-326 7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 PEABODY MA
— 978-328 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-358 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 NEWBURYPT MA
— 978-384 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MERRIMAC MA
— 978-402 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 CONCORD MA
— 978-421 3XXX4XXX5XXX6XXX7XXX which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-424 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 FITCHBURG MA
— 978-487 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 AYER MA
— 978-498 4XXX which blocks → TC SYSTEMS, INC. 7135 SALEM MA
— 978-503 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 FITCHBURG MA
— 978-523 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 TOWNSEND MA
— 978-539 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 DANVERS MA
— 978-548 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 PEABODY MA
— 978-552 3XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LAWRENCE MA
— 978-559 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 GLOUCESTER MA
— 978-570 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 WILMINGTON MA
— 978-614 0XXX5XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-645 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 LAWRENCE MA
— 978-677 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-698 0XXX2XXX4XXX5XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 LITTLETON MA
— 978-720 7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BEVERLY MA
— 978-730 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → TC SYSTEMS, INC. 7135 GARDNER MA
— 978-732 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 GROTON MA
— 978-753 8XXX which blocks → TC SYSTEMS, INC. 7135 WILMINGTON MA
— 978-765 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 CLINTON MA
— 978-778 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BEVERLY MA
— 978-792 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 AMESBURY MA
— 978-795 0XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 ACTON MA
— 978-805 8XXX which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
— 978-889 9XXX which blocks → TC SYSTEMS, INC. 7135 MAYNARD MA
— 978-933 1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 ANDOVER 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.