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 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 240-212 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
— 240-213 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WALDORF MD
— 240-214 none assigned yet which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G MECHANCSVL MD
— 240-215 2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
— 240-218 none assigned yet which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G NANJEMOY MD
— 240-220 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G POOLESVL MD
— 240-221 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 240-222 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WALDORF MD
— 240-223 7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
— 240-225 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 FREDERICK MD
— 240-228 1XXX2XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-229 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
— 240-230 2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HUGHESVL MD
— 240-231 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
— 240-232 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
— 240-233 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 TOMPKINSVL MD
— 240-235 not yet reported which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN2 MD
— 240-236 6XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-237 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 LXTNPKGRML MD
— 240-238 not yet reported which blocks → PAETEC ITEL, LLC 829J WSNGTNZN10 MD
— 240-239 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
— 240-241 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSNG236Z13 MD
— 240-242 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSNGTNZN11 MD
— 240-243 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
— 240-244 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSNGTNZN16 MD
— 240-245 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSNG236Z14 MD
— 240-246 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 GAITHERSBG MD
— 240-247 3XXX7XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
— 240-248 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G RIDGE MD
— 240-249 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 MECHANCSVL MD
— 240-250 1XXX which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G BRANDYWINE MD
— 240-251 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HIGHFIELD MD
— 240-252 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
— 240-253 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN6 MD
— 240-254 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 HUGHESVL MD
— 240-255 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G POOLESVL MD
— 240-256 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 LEONARDTN MD
— 240-257 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 NANJEMOY MD
— 240-258 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 RIDGE MD
— 240-260 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z14 MD
— 240-262 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J LXTNPKGRML MD
— 240-263 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
— 240-264 0XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 240-266 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSNG236Z14 MD
— 240-268 4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN10 MD
— 240-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSNGTNZN16 MD
— 240-271 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
— 240-273 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN6 MD
— 240-274 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
— 240-275 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 GRANTSVL MD

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.