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 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
— 570-552 not yet reported which blocks → CTSI, INC. - PA 7513 WILKSBARRE PA
— 570-553 3XXX5XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 ST JOSEPH PA
— 570-554 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 MT CARMEL PA
— 570-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST PA
— 570-557 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWMILFORD PA
— 570-558 not yet reported which blocks → CTSI, INC. - PA 7513 SCRANTON PA
— 570-559 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON NORTH, INC. - PA (QUAKER ST) 0201 SHOHOLA PA
— 570-561 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → XO COMMUNICATIONS SERVICES, INC. - PA 7341 SCRANTON PA
— 570-562 5XXX6XXX8XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 TAYLOR PA
— 570-563 4XXX5XXX6XXX7XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 DALTON PA
— 570-565 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 TAYLOR PA
— 570-567 3XXX4XXX7XXX · 3 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 WILLIAMSPT PA
— 570-568 not yet reported which blocks → WINDSTREAM BUFFALO VALLEY, INC. 0151 LEWISBURG PA
— 570-570 not yet reported which blocks → PA
— 570-576 3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J HAWLEY PA
— 570-577 not yet reported which blocks → WINDSTREAM BUFFALO VALLEY, INC. 0151 LEWISBURG PA
— 570-579 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J HAZLETON PA
— 570-581 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 POTTSVILLE PA
— 570-582 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAZLETON PA
— 570-584 7XXX8XXX · 2 holders which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 HUGHESVL 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
— 570-588 8XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 BUSHKILL PA
— 570-590 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ASHLAND PA
— 570-593 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 SCHUYLKHVN PA
— 570-594 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BLOOMSBURG PA
— 570-595 1XXX4XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 CRESCO PA
— 570-596 0XXX which blocks → NORTH PENN TEL. CO. 0192 BENTLEYCRK PA
— 570-598 not yet reported which blocks → SPOK, INC. 6630 OLYPHANT PA
— 570-600 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - PA 547E MIDDLEBURG PA
— 570-601 2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CTSI, INC. - PA 7513 WILLIAMSPT PA
— 570-602 not yet reported which blocks → CTSI, INC. - PA 7513 PITTSTON PA
— 570-603 9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 PITTSTON PA
— 570-604 not yet reported which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 SCRANTON PA
— 570-606 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILKSBARRE PA
— 570-608 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 SWEET VLY PA
— 570-609 0XXX1XXX2XXX3XXX5XXX9XXX · 5 holders which blocks → ONVOY, LLC - PA 547E WYOMING PA
— 570-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 570-612 0–9 XXXall 10 · 4 holders which blocks → LIMITLESS MOBILE, LLC 6921 SHENANDOAH PA
— 570-613 2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → CTSI, INC. - PA 7513 WYOMING PA
— 570-614 3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 SCRANTON PA
— 570-616 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - PA 547E HONESDALE PA
— 570-617 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 POTTSVILLE PA
— 570-619 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 STROUDSBG PA
— 570-620 none assigned yet which blocks → VERIZON PENNSYLVANIA, INC. 9208 STROUDSBG PA
— 570-621 8XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 POTTSVILLE PA
— 570-622 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 POTTSVILLE PA
— 570-623 1XXX6XXX7XXX8XXX · 4 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 LITTLE MDW PA
— 570-624 0XXX1XXX2XXX4XXX6XXX8XXX9XXX · 7 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 POTTSVILLE 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.