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
RCN TELECOM SERVICES, INC. - MA 26
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
2001-05-30 781-315 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 READING MA
2001-05-30 781-606 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MELROSE MA
2001-05-30 781-728 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 LINCOLN MA
2001-02-23 781-992 1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WELLESLEY MA
— 781-209 4XXX5XXX6XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WALTHAM MA
— 781-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 NORWOOD MA
— 781-316 4XXX5XXX6XXX7XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ARLINGTON MA
— 781-361 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 KINGSTON MA
— 781-381 4XXX5XXX6XXX7XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 DEDHAM MA
— 781-428 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BRAINTREE MA
— 781-448 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ROCKLAND MA
— 781-491 2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WOBURN MA
— 781-539 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MEDFORD MA
— 781-546 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SCITUATE MA
— 781-559 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 NEEDHAM MA
— 781-572 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 STONEHAM MA
— 781-621 0XXX1XXX2XXX5XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WAKEFIELD MA
— 781-627 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MALDEN MA
— 781-630 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 HINGHAM MA
— 781-652 1XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 LEXINGTON MA
— 781-717 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WINCHESTER MA
— 781-731 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 LYNN MA
— 781-750 0XXX1XXX9XXX · 2 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BURLINGTON MA
— 781-776 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 LYNNFIELD MA
— 781-824 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 RANDOLPH MA
— 781-867 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SHARON 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.