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
VERIZON PENNSYLVANIA, INC. 156
COMMONWEALTH TELEPHONE COMPANY LLC 75
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 75
NEW CINGULAR WIRELESS PCS, LLC - DC 68
CORE COMMUNICATIONS, INC. - PA 62
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
— 570-257 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 LORDS VLY PA
— 570-258 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CTSI, INC. - PA 7513 NANTICOKE PA
— 570-261 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J MOUNTANTOP PA
— 570-262 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WILKSBARRE PA
— 570-265 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TOWANDA PA
— 570-267 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CARBONDALE PA
— 570-268 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 TOWANDA PA
— 570-270 not yet reported which blocks → CTSI, INC. - PA 7513 WILKSBARRE PA
— 570-271 9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 DANVILLE PA
— 570-273 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 NESQUHONNG PA
— 570-275 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 DANVILLE PA
— 570-276 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 GIRARDVL PA
— 570-277 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 NEWPHLDLPH PA
— 570-278 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MONTROSE PA
— 570-280 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 CARBONDALE PA
— 570-281 0XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 CARBONDALE PA
— 570-282 9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 CARBONDALE PA
— 570-283 7XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 KINGSTON PA
— 570-285 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 KINGSTON PA
— 570-286 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 SUNBURY PA
— 570-287 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 KINGSTON PA
— 570-288 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 KINGSTON PA
— 570-289 2XXX3XXX6XXX · 3 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 BROOKLYN PA
— 570-291 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J OLYPHANT PA
— 570-292 not yet reported which blocks → LIMITLESS MOBILE, LLC 6921 POTTSVILLE PA
— 570-293 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J DANVILLE PA
— 570-294 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 POTTSVILLE PA
— 570-296 not yet reported which blocks → VERIZON NORTH, INC. - PA (QUAKER ST) 0201 MILFORD 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
— 570-300 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PITTSTON PA
— 570-301 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 WILKSBARRE PA
— 570-307 9XXX which blocks → CTSI, INC. - PA 7513 OLYPHANT PA
— 570-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 570-313 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PITTSTON PA
— 570-315 not yet reported which blocks → SPOK, INC. 6630 SCRANTON PA
— 570-317 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA 7434 BLOOMSBURG PA
— 570-318 6XXX7XXX8XXX9XXX · 2 holders which blocks → SCHUYLKILL MOBILE FONE, INC. 6739 WILLIAMSPT PA
— 570-320 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-321 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-322 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-323 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-324 1XXX4XXX7XXX8XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 LIBERTY PA
— 570-325 1XXX6XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 JIM THORPE PA
— 570-326 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-327 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-329 6XXX7XXX8XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 WILLIAMSPT PA
— 570-330 4XXX6XXX7XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 SCRANTON PA
— 570-331 1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 KINGSTON PA
— 570-333 2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 CTR MORELD 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.