NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 240-331 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSHNGTNZN3 MD
— 240-332 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G TOMPKINSVL MD
— 240-334 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
— 240-335 2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSNG236Z14 MD
— 240-336 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
— 240-337 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN5 MD
— 240-338 4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-339 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WSNG236Z15 MD
— 240-342 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 ASHTON236 MD
— 240-346 0XXX2XXX which blocks → METROPCS, INC. 5562 WALDORF MD
— 240-348 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN16 MD
— 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

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.