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 508
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
2001-02-21 508-918 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 FRANKLIN MA
— 508-213 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WEBSTER MA
— 508-215 4XXX6XXX7XXX8XXX9XXX which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-216 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 FOXBORO MA
— 508-217 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 BRIDGEWTR MA
— 508-244 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 MILFORD MA
— 508-293 0XXX1XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 HOPKINTON MA
— 508-305 2XXX5XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 MARLBORO MA
— 508-309 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-343 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 SEEKONK MA
— 508-346 2XXX6XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 FRANKLIN MA
— 508-382 2XXX4XXX6XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 MARLBORO MA
— 508-404 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 WALPOLE MA
— 508-416 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-467 not yet reported which blocks → TC SYSTEMS, INC. 7135 MARLBORO MA
— 508-468 0–9 XXXall 10 · 3 holders which blocks → TC SYSTEMS, INC. 7135 BROCKTON MA
— 508-501 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → TC SYSTEMS, INC. 7135 NEWBEDFORD MA
— 508-513 5XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BROCKTON MA
— 508-518 not yet reported which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-571 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 NORTHBORO MA
— 508-591 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 PLYMOUTH MA
— 508-594 0XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MANSFIELD MA
— 508-621 6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 WESTBORO MA
— 508-688 0XXX1XXX2XXX4XXX5XXX7XXX9XXX which blocks → TC SYSTEMS, INC. 7135 WORCESTER MA
— 508-689 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 FALL RIVER MA
— 508-744 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 BARNSTABLE MA
— 508-762 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WORCESTER MA
— 508-782 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-804 5XXX6XXX7XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 MARLBORO MA
— 508-808 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → TC SYSTEMS, INC. 7135 FRAMINGHAM MA
— 508-827 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 HYANNIS MA
— 508-838 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 ATTLEBORO MA
— 508-844 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 TAUNTON MA
— 508-903 0XXX3XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 NATICK MA
— 508-925 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 SHREWSBURY MA
— 508-926 7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 WORCESTER MA
— 508-927 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 PLYMOUTH MA
— 508-948 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WESTBORO MA
— 508-952 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 NORTON 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.