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 401
COMCAST IP PHONE, LLC 35
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
2018-12-19 401-205 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PAWTUCKET RI
2017-11-08 401-240 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BRISTOL RI
— 401-213 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CAROLINA RI
— 401-270 not yet reported which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-284 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NARRAGNSTT RI
— 401-289 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WARREN RI
— 401-293 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PORTSMOUTH RI
— 401-315 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WESTERLY RI
— 401-349 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CENTREDALE RI
— 401-356 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WOONSOCKET RI
— 401-383 8XXX which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-385 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J COVENTRY RI
— 401-396 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BRISTOL RI
— 401-398 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GREENWICH RI
— 401-405 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CUMBLND HL RI
— 401-443 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-475 5XXX6XXX which blocks → COMCAST IP PHONE, LLC 318J PAWTUCKET RI
— 401-491 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HOPEVALLEY RI
— 401-552 1XXX2XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CAROLINA RI
— 401-560 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J JAMESTOWN RI
— 401-584 1XXX7XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WESTERLY RI
— 401-592 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LTLCOMPTON RI
— 401-597 2XXX5XXX6XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WOONSOCKET RI
— 401-615 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J W WARWICK RI
— 401-619 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J NEWPORT RI
— 401-632 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-637 0XXX1XXX4XXX7XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WESTERLY RI
— 401-667 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NO KINGSTN RI
— 401-710 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PASCOAG RI
— 401-714 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-753 1XXX5XXX6XXX7XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PAWTUCKET RI
— 401-764 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J SCITUATE RI
— 401-816 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TIVERTON RI
— 401-921 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J WARWICK RI
— 401-992 2XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WGLOCESTER RI

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.