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 570
COMMONWEALTH TELEPHONE COMPANY LLC 75
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
2012-07-05 570-761 0–9 XXXall 10 · 7 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALLAS PA
2004-01-09 570-355 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA
2001-06-14 570-255 4XXX6XXX7XXX8XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALLAS PA
— 570-247 3XXX4XXX6XXX8XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 ROME PA
— 570-256 1XXX2XXX5XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MUHLENBURG PA
— 570-265 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TOWANDA PA
— 570-268 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TOWANDA PA
— 570-278 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MONTROSE PA
— 570-289 2XXX3XXX6XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 BROOKLYN PA
— 570-297 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TROY PA
— 570-298 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 NOXEN PA
— 570-324 1XXX4XXX7XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 LIBERTY PA
— 570-333 2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CTR MORELD PA
— 570-353 1XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MORRIS PA
— 570-358 2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 ULSTER PA
— 570-363 3XXX4XXX8XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 NEW ALBANY PA
— 570-376 1XXX6XXX7XXX8XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MIDLEBYCTR PA
— 570-378 4XXX7XXX8XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 LAKEWINOLA PA
— 570-379 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 WAPWALLOPN PA
— 570-384 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 NUREMBERG PA
— 570-388 1XXX5XXX7XXX8XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 HARDING PA
— 570-395 2XXX4XXX5XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 WARREN CTR PA
— 570-402 5XXX6XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 SAYLORSBG PA
— 570-477 6XXX7XXX8XXX which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 SWEET VLY PA
— 570-482 1XXX5XXX6XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MUNCY VLY PA
— 570-513 3XXX4XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MANSFIELD PA
— 570-525 1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 EAGLESMERE PA
— 570-542 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 SHICKSHINY PA
— 570-553 3XXX5XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 ST JOSEPH PA
— 570-563 4XXX5XXX6XXX7XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALTON PA
— 570-585 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CLARKSSMMT PA
— 570-586 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CLARKSSMMT PA
— 570-587 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CLARKSSMMT PA
— 570-631 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALLAS PA
— 570-638 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 BLOSSBURG PA
— 570-639 6XXX which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 HARVEYS LK PA
— 570-643 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA
— 570-646 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA
— 570-659 1XXX2XXX6XXX7XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 COVINGTON PA
— 570-662 5XXX which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MANSFIELD PA
— 570-674 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALLAS PA
— 570-675 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALLAS PA
— 570-678 1XXX2XXX4XXX6XXX8XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 NUANGOLA PA
— 570-682 5XXX6XXX7XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 VALLEYVIEW PA
— 570-683 1XXX2XXX3XXX4XXX7XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 ORANGEVL PA
— 570-695 1XXX5XXX6XXX7XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TREMONT PA
— 570-696 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TRUCKSVL PA
— 570-708 4XXX5XXX6XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CNYNGHDRMS PA
— 570-723 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 WELLSBORO PA
— 570-724 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 WELLSBORO PA

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.