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 781
TC SYSTEMS, INC. 57
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
2021-05-26 781-678 0–9 XXXall 10 · 4 holders which blocks → TC SYSTEMS, INC. 7135 HULL MA
2021-02-12 781-612 0–9 XXXwhole prefix which blocks → TC SYSTEMS, INC. 7135 CANTON MA
2010-03-04 781-225 0–9 XXXwhole prefix which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
2005-03-18 781-918 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-202 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 BURLINGTON MA
— 781-205 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 READING MA
— 781-216 0XXX1XXX2XXX3XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-218 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 WINCHESTER MA
— 781-266 6XXX7XXX8XXX which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-285 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 DUXBURY MA
— 781-298 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-302 6XXX which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-350 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MEDFORD MA
— 781-364 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-370 not yet reported which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-375 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 DEDHAM MA
— 781-406 0XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 LYNNFIELD MA
— 781-417 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 SAUGUS MA
— 781-423 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 ROCKLAND MA
— 781-429 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 NEEDHAM MA
— 781-430 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-434 8XXX9XXX which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-443 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 ARLINGTON MA
— 781-451 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WAKEFIELD MA
— 781-462 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MELROSE MA
— 781-464 0XXX which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-471 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 DEDHAM MA
— 781-472 0XXX1XXX2XXX4XXX5XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-482 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-499 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TC SYSTEMS, INC. 7135 HANOVER MA
— 781-527 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 COHASSET MA
— 781-530 0XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-534 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WEYMOUTH MA
— 781-537 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WOBURN MA
— 781-556 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 HINGHAM MA
— 781-557 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WAKEFIELD MA
— 781-560 0XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 REVERE MA
— 781-565 8XXX which blocks → TC SYSTEMS, INC. 7135 BURLINGTON MA
— 781-584 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 LYNN MA
— 781-594 not yet reported which blocks → TC SYSTEMS, INC. 7135 LYNN MA
— 781-607 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 RANDOLPH MA
— 781-635 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 NORWELL MA
— 781-638 none assigned yet which blocks → TC SYSTEMS, INC. 7135 WOBURN MA
— 781-653 1XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 BURLINGTON MA
— 781-680 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 NORWOOD MA
— 781-685 8XXX which blocks → TC SYSTEMS, INC. 7135 BURLINGTON MA
— 781-707 6XXX8XXX which blocks → TC SYSTEMS, INC. 7135 NEEDHAM MA
— 781-754 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 BRYANTVL MA
— 781-763 1XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 ROCKLAND MA
— 781-817 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 BRAINTREE 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.