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 724
VERIZON PENNSYLVANIA, INC. 166
TELEPORT COMMUNICATIONS AMERICA, LLC - PA 74
LEVEL 3 COMMUNICATIONS, LLC - PA 69
NEW CINGULAR WIRELESS PCS, LLC - IL 60
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 59
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
2001-06-15 724-574 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 VANDERGRFT PA
2001-06-15 724-732 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 BEAVER FLS PA
2001-06-14 724-420 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GREENSBURG PA
2001-06-14 724-462 2XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 ROCHESTER PA
2001-06-14 724-882 7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 NEWKNSNGTN PA
2001-05-31 724-605 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GROVE CITY PA
2001-05-31 724-816 2XXX3XXX4XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 CRIDERSCOR PA
2001-05-31 724-880 6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 UNIONTOWN PA
2001-05-31 724-992 2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 GROVE CITY PA
2001-05-30 724-220 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 SCOTTDALE PA
2001-05-30 724-461 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 DELMONT PA
2001-05-30 724-488 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 AMBRIDGE PA
2001-05-30 724-549 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 INDIANA PA
2001-05-30 724-673 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J MCDONALD PA
2001-05-30 724-810 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 BELLEVRNON PA
2001-05-03 724-318 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 AMBRIDGE PA
2001-05-03 724-359 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 BEAVER FLS PA
2001-05-02 724-305 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 DONORA PA
2001-05-02 724-398 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 DAWSON PA
2001-05-02 724-560 0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 FAYETTE CY PA
2001-05-02 724-908 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PERRYOPOLS PA
2001-04-16 724-553 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CRIDERSCOR PA
2001-04-16 724-831 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CRIDERSCOR PA
2001-03-14 724-417 6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCHESTER PA
2001-03-14 724-650 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCHESTER PA
2001-03-12 724-249 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 WASHINGTON PA
2001-03-12 724-257 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 TARENTUM PA
2001-03-12 724-262 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MARCHAND PA
2001-03-12 724-303 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 LOWELLVL PA
2001-03-12 724-317 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CORE COMMUNICATIONS, INC. - PA 3806 UNIONTOWN PA
2001-03-12 724-382 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PTGSBNZN23 PA
2001-03-12 724-383 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 SHARPSVL PA
2001-03-12 724-418 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2001-03-12 724-427 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 INDIANA PA
2001-03-12 724-441 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 LIGONIER PA
2001-03-12 724-480 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 ROCHESTER PA
2001-03-12 724-505 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PT MARION PA
2001-03-12 724-517 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 IMPERIAL PA
2001-03-12 724-521 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PARIS PA
2001-03-12 724-536 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 NEWFLORNCE PA
2001-03-12 724-581 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 BEAVER FLS PA
2001-03-12 724-655 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MCMURRAY PA
2001-03-12 724-660 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MIDLAND PA
2001-03-12 724-665 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 BELLEVRNON PA
2001-03-12 724-698 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 NEW CASTLE PA
2001-03-12 724-707 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 CONNELLSVL PA
2001-03-12 724-788 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 ALIQUIPPA PA
2001-03-12 724-893 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MERCER PA
2001-03-12 724-937 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CORE COMMUNICATIONS, INC. - PA 3806 GROVE CITY PA
2001-03-12 724-952 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 MASONTOWN 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.