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
VERIZON MARYLAND, INC. 49
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
2020-03-19 240-721 0–9 XXXall 10 · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
2016-07-01 240-592 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
2010-04-28 240-583 0–9 XXXall 10 · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2008-05-27 240-964 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
2007-05-07 240-826 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2006-12-22 240-586 0–9 XXXall 10 · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
2006-07-12 240-567 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2004-05-04 240-276 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2002-06-11 240-566 0–9 XXXall 10 · 7 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
2001-05-22 240-442 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 OAKLAND MD
2001-05-22 240-699 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BUCKEYSTN MD
— 240-221 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 240-228 1XXX2XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-236 6XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-264 0XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 240-292 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 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
— 240-318 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 240-328 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-362 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 240-373 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-379 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK 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
— 240-420 9XXX which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN 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
— 240-497 7XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 240-527 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 240-529 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-568 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 240-582 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 240-624 0XXX1XXX2XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-629 8XXX which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 240-631 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-632 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-662 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 240-683 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-684 0XXX4XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-686 5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-694 5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 240-695 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 240-725 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 240-773 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-777 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-895 1XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 240-999 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 XXXXXXXXXX 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.