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 610
VERIZON PENNSYLVANIA, INC. 325
NEW CINGULAR WIRELESS PCS, LLC - DC 56
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 43
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA 39
TELEPORT COMMUNICATIONS AMERICA, LLC - PA 38
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
— 610-392 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ALLENTOWN PA
— 610-393 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ALLENTOWN PA
— 610-394 5XXX8XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 PHPHSBZN17 PA
— 610-395 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-396 2XXX5XXX7XXX · 2 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 READING PA
— 610-397 9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 PHPHSBZN31 PA
— 610-398 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-399 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 WESTTOWN PA
— 610-401 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7315 READING PA
— 610-402 not yet reported which blocks → CTSI, INC. - PA 7513 ALLENTOWN PA
— 610-403 9XXX which blocks → SERVICE ELECTRIC TELEPHONE COMPANY, LLC 8320 CATASAUQUA PA
— 610-404 not yet reported which blocks → WINDSTREAM CONESTOGA, INC. 0162 BIRDSBORO PA
— 610-405 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PHPHSBZN30 PA
— 610-406 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 READING PA
— 610-407 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 PHPHSBZN28 PA
— 610-408 5XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 PHPHSBZN28 PA
— 610-409 4XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 COLLEGEVL PA
— 610-410 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 CENTER PT PA
— 610-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 610-413 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 READING PA
— 610-414 not yet reported which blocks → SPOK, INC. 6630 POTTSTOWN PA
— 610-415 4XXX5XXX7XXX8XXX · 4 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 PHOENIXVL PA
— 610-416 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PHPHSBZN30 PA
— 610-417 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 BETHLEHEM PA
— 610-418 not yet reported which blocks → SPOK, INC. 6630 W CHESTER PA
— 610-419 5XXX7XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 BETHLEHEM PA
— 610-420 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 PHPHSBZN30 PA
— 610-421 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 EMMAUS PA
— 610-422 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7309 PHOENIXVL PA
— 610-423 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J EXTON PA
— 610-425 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 W CHESTER PA
— 610-426 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7309 KUTZTOWN PA
— 610-427 0–9 XXXall 10 · 8 holders which blocks → AT&T - LOCAL 7421 POTTSTOWN PA
— 610-428 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 BETHLEHEM PA
— 610-429 7XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 W CHESTER PA
— 610-430 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 W CHESTER PA
— 610-431 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 W CHESTER PA
— 610-432 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-433 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-434 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-435 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-436 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 W CHESTER PA
— 610-437 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-438 7XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 EASTON PA
— 610-439 9XXX which blocks → VERIZON PENNSYLVANIA, INC. 9208 ALLENTOWN PA
— 610-440 3XXX4XXX7XXX · 2 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 NORTHAMPTN PA
— 610-441 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 W CHESTER PA
— 610-442 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 BETHLEHEM PA
— 610-443 4XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 CATASAUQUA PA
— 610-444 not yet reported which blocks → VERIZON PENNSYLVANIA, INC. 9208 KENNETT SQ 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.