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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 240-279 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
— 240-280 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LAUREL236 MD
— 240-281 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
— 240-282 1XXX which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G MECHANCSVL MD
— 240-283 4XXX5XXX7XXX which blocks → PAETEC ITEL, LLC 829J WSNGTNZN11 MD
— 240-285 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
— 240-287 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HANCOCK MD
— 240-289 2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN6 MD
— 240-290 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN11 MD
— 240-292 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 240-293 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WSNGTNZN12 MD
— 240-294 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAUREL236 MD
— 240-295 2XXX3XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J LAUREL236 MD
— 240-296 2XXX which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN4 MD
— 240-297 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z13 MD
— 240-298 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LEONARDTN MD
— 240-299 none assigned yet which blocks → METROPCS, INC. 5562 WALDORF MD
— 240-303 2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN16 MD
— 240-305 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-306 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
— 240-308 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DAMASCS236 MD
— 240-310 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 4720 HAGERSTOWN MD
— 240-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 240-312 2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN5 MD
— 240-313 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 240-314 9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-315 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-316 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
— 240-317 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 LXTNPKGRML MD
— 240-318 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 240-320 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J WALDORF MD
— 240-321 8XXX9XXX · 2 holders which blocks → USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 4720 OAKLAND MD
— 240-322 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
— 240-323 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 EMMITSBURG MD
— 240-325 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
— 240-326 2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNG236Z15 MD
— 240-327 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
— 240-328 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-329 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN 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.