NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

372 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 570-513 3XXX4XXX · 2 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 MANSFIELD PA
— 570-517 1XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → CTSI, INC. - PA 7513 STROUDSBG PA
— 570-520 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - PA 002F BERWICK PA
— 570-521 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JERMYN PA
— 570-522 not yet reported which blocks → WINDSTREAM BUFFALO VALLEY, INC. 0151 LEWISBURG PA
— 570-523 not yet reported which blocks → WINDSTREAM BUFFALO VALLEY, INC. 0151 LEWISBURG PA
— 570-524 not yet reported which blocks → WINDSTREAM BUFFALO VALLEY, INC. 0151 LEWISBURG PA
— 570-525 1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 EAGLESMERE PA
— 570-531 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - PA 547E RENOVO PA
— 570-537 0XXX which blocks → NORTH PENN TEL. CO. 0192 MILLERTON PA
— 570-538 8XXX which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 WATSONTOWN PA
— 570-539 1XXX5XXX7XXX9XXX · 3 holders which blocks → VERIZON NORTH, INC. - PA (CONTEL) 0170 MTPLSANTML PA
— 570-542 not yet reported which blocks → COMMONWEALTH TELEPHONE COMPANY LLC 0161 SHICKSHINY PA
— 570-543 1XXX2XXX3XXX5XXX6XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TAYLOR PA
— 570-544 0XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 MINERSVL PA
— 570-545 4XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 MANSFIELD PA
— 570-546 not yet reported which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 MUNCY PA
— 570-547 4XXX which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 MONTGOMERY PA
— 570-549 0XXX which blocks → NORTH PENN TEL. CO. 0192 ROSEVILLE PA
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.