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
CORE COMMUNICATIONS, INC.- MD 32
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
2018-06-12 240-648 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2018-06-12 240-649 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2018-06-11 240-596 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2018-06-11 240-598 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2018-06-11 240-610 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2018-06-11 240-622 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LA PLATA MD
2018-06-11 240-628 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 MECHANCSVL MD
2018-06-11 240-634 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2018-06-11 240-635 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2018-06-11 240-637 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-06-11 240-647 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2018-06-11 240-679 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2018-06-01 240-639 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2012-06-22 240-800 0–9 XXXall 10 · 7 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2006-08-08 240-512 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
— 240-212 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
— 240-225 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 FREDERICK MD
— 240-231 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
— 240-239 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
— 240-251 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HIGHFIELD 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
— 240-287 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HANCOCK 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
— 240-327 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
— 240-336 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
— 240-369 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 MOUNT AIRY MD
— 240-378 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
— 240-530 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
— 240-548 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 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.