NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 603
COMCAST IP PHONE, LLC 40
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
2022-10-06 603-697 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DOVER NH
2022-09-29 603-649 7XXX which blocks → COMCAST IP PHONE, LLC 318J JAFFREY NH
2022-09-01 603-619 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J LACONIA NH
2021-09-09 603-441 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROCHESTER NH
2018-07-31 603-403 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J ROCHESTER NH
2013-01-04 603-260 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DERRY NH
2012-11-08 603-213 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MILFORD NH
2011-08-16 603-200 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NEWMARKET NH
2010-07-30 603-814 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SEABROOK NH
2010-03-29 603-510 0XXX which blocks → COMCAST IP PHONE, LLC 318J MERIDEN NH
2009-11-23 603-808 0XXX1XXX2XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J ANTRIM NH
2009-11-17 603-705 0XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SALISBURY NH
2009-11-17 603-877 0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NEW LONDON NH
2009-11-17 603-902 0XXX which blocks → COMCAST IP PHONE, LLC 318J SUTTON NH
2009-11-17 603-961 0XXX which blocks → COMCAST IP PHONE, LLC 318J CHICHESTER NH
2009-11-17 603-977 0XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J ANDOVER NH
2009-11-16 603-840 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J EPSOM NH
2009-11-16 603-975 0XXX7XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BOSCAWEN NH
2006-11-07 603-392 0XXX1XXX2XXX7XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WINCHESTER NH
2006-10-26 603-291 0XXX1XXX2XXX3XXX7XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J GREENVILLE NH
2006-10-13 603-277 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HANOVER NH
2005-02-18 603-708 0XXX1XXX3XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J CANTERBURY NH
2002-05-20 603-836 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MANCHESTER NH
— 603-210 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SUNCOOK NH
— 603-216 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DERRY NH
— 603-232 0XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MANCHESTER NH
— 603-244 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J RAYMOND NH
— 603-292 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J NEWMARKET NH
— 603-343 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J DOVER NH
— 603-347 0XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J KINGSTON NH
— 603-384 0XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GOFFSTOWN NH
— 603-397 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DURHAM NH
— 603-458 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SALEM NH
— 603-488 0XXX6XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BEDFORD NH
— 603-489 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HAMPSTEAD NH
— 603-580 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J EXETER NH
— 603-715 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CONCORD NH
— 603-841 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SOMERSWTH NH
— 603-935 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MANCHESTER NH
— 603-974 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PLAISTOW NH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.