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 346
COMCAST IP PHONE, LLC 31
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
2023-04-28 346-650 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J VLY LODGE TX
2023-03-10 346-635 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2023-02-23 346-618 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2022-10-03 346-594 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BARKER TX
2022-09-21 346-591 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J PORTER HTS TX
2022-09-20 346-590 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WESTFIELD TX
2020-10-07 346-442 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2020-10-07 346-443 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2020-10-05 346-439 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-440 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-441 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2020-02-26 346-423 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PORTER TX
2019-12-24 346-409 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2019-07-26 346-389 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BEACH CITY TX
2019-03-27 346-385 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J FRIENDSWD TX
2018-05-29 346-341 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J STAFFORD TX
2018-05-29 346-342 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2018-04-17 346-335 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2016-02-04 346-223 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2016-02-04 346-226 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2016-02-04 346-227 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2015-12-17 346-319 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2015-09-28 346-309 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SUGAR LAND TX
2015-09-15 346-571 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2015-08-18 346-270 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BAMMEL TX
2015-07-28 346-304 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J STAFFORD TX
2015-07-17 346-331 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2015-06-22 346-224 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2015-06-22 346-240 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2015-03-04 346-703 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J PINEHURST TX
2015-01-28 346-219 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX

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.