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 484
CORE COMMUNICATIONS, INC. - PA 29
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
2019-03-20 484-837 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 EASTON PA
2009-03-17 484-317 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 GREENHILLS PA
2009-03-17 484-405 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 BOYERTOWN PA
2009-03-17 484-407 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 YELLOW HS PA
2009-03-13 484-236 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 DOUGLASSVL PA
2009-03-13 484-295 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 BIRDSBORO PA
2009-03-13 484-304 0XXX1XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 TOPTON PA
2009-03-13 484-404 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 BANGOR PA
2009-03-13 484-491 0XXX1XXX2XXX3XXX4XXX8XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 OLEY PA
— 484-283 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 KEMBLESVL PA
— 484-380 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN25 PA
— 484-389 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN25 PA
— 484-390 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
— 484-392 0–9 XXXall 10 · 7 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
— 484-449 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN12 PA
— 484-457 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN21 PA
— 484-580 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN26 PA
— 484-606 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 LENAPE PA
— 484-647 0–9 XXXall 10 · 7 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 NEWSMITHVL PA
— 484-675 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN21 PA
— 484-689 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN30 PA
— 484-728 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
— 484-738 0XXX1XXX2XXX4XXX5XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 KENNETT SQ PA
— 484-776 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MENDENHALL PA
— 484-814 0XXX1XXX2XXX4XXX · 2 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 SPRINGTOWN PA
— 484-849 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN10 PA
— 484-897 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 LANDENBERG PA
— 484-972 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 COLLEGEVL PA
— 484-977 0XXX1XXX3XXX4XXX8XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 COLLEGEVL PA

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.