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 240
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 117
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 85
NEW CINGULAR WIRELESS PCS, LLC - DC 69
PAETEC ITEL, LLC 63
LEVEL 3 COMMUNICATIONS, LLC - MD 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 240-349 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MD 876D LA PLATA MD
— 240-350 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-351 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-352 8XXX which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G LA PLATA MD
— 240-353 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-354 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-355 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-356 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MYERSVILLE MD
— 240-358 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G DAMASCS236 MD
— 240-359 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G INDIANHEAD MD
— 240-361 7XXX8XXX which blocks → PAETEC ITEL, LLC 829J GAITHERSBG MD
— 240-362 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 240-363 not yet reported which blocks → ONVOY, LLC - MD 876D WSNGTNZN11 MD
— 240-365 not yet reported which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 DAMASCS236 MD
— 240-366 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WILLIAMSPT MD
— 240-368 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WALDORF MD
— 240-369 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 MOUNT AIRY MD
— 240-371 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSNGTNZN12 MD
— 240-372 none assigned yet which blocks → METROPCS, INC. 5562 GAITHERSBG MD
— 240-373 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-374 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LAUREL236 MD
— 240-375 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
— 240-376 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G HUGHESVL MD
— 240-377 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 INDIANHEAD MD
— 240-378 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
— 240-379 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-381 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-383 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
— 240-384 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G LXTNPKGRML MD
— 240-385 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 MYERSVILLE MD
— 240-386 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-387 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSNG236Z13 MD
— 240-389 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ASHTON236 MD
— 240-390 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J ASHTON236 MD
— 240-391 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSNG236Z13 MD
— 240-392 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSHNGTNZN5 MD
— 240-393 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-395 3XXX6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN2 MD
— 240-396 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
— 240-399 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN10 MD
— 240-401 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN10 MD
— 240-403 7XXX which blocks → PAETEC ITEL, LLC 829J WSNGTNZN10 MD
— 240-407 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN16 MD
— 240-409 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FREDERICK MD
— 240-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 240-414 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSHNGTNZN6 MD
— 240-417 none assigned yet which blocks → METROPCS, INC. 5562 WSHNGTNZN5 MD
— 240-420 9XXX which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 240-425 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
— 240-428 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN10 MD

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.