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
— 240-399 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
— 240-430 6XXX8XXX which blocks → PAETEC ITEL, LLC 829J WSNGTNZN11 MD
— 240-431 0XXX2XXX4XXX5XXX6XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LXTNPKGRML MD
— 240-432 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-433 2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN12 MD
— 240-434 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LEONARDTN MD
— 240-436 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BUCKEYSTN MD
— 240-437 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ASHTON236 MD
— 240-445 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN2 MD
— 240-447 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN10 MD
— 240-448 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WALDORF MD
— 240-449 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
— 240-450 2XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN3 MD
— 240-453 1XXX4XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-456 1XXX which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 240-460 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-461 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-462 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 240-463 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-464 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
— 240-465 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSHNGTNZN2 MD
— 240-471 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSNGTNZN12 MD
— 240-472 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-473 2XXX3XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSNG236Z13 MD
— 240-475 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
— 240-482 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN2 MD
— 240-483 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WSHNGTNZN2 MD
— 240-485 4XXX6XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN3 MD
— 240-487 4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN4 MD
— 240-491 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
— 240-492 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN5 MD
— 240-493 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN6 MD
— 240-497 7XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 240-498 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
— 240-499 4XXX5XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN10 MD
— 240-502 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
— 240-508 none assigned yet which blocks → METROPCS, INC. 5562 WSHNGTNZN5 MD
— 240-510 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z15 MD
— 240-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 240-514 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN11 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.