NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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 410
VERIZON MARYLAND, INC. 510
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
— 410-879 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-880 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-882 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-883 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 SHARPTOWN MD
— 410-884 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-885 0XXX1XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 CHESAPKECY MD
— 410-886 0XXX1XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 TILGHMAN MD
— 410-887 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-888 0XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-889 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-892 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-893 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-895 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-896 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 DELMAR MD
— 410-897 2XXX7XXX which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-898 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-901 3XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 CAMBRIDGE MD
— 410-902 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-906 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-918 7XXX8XXX which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-922 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 RANDALLSTN MD
— 410-923 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 MILLERSVL MD
— 410-928 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 MILLINGTON MD
— 410-931 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-933 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-938 0XXX1XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-939 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAVREGRACE MD
— 410-942 2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 HAVREGRACE MD
— 410-943 2XXX5XXX6XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 HURLOCK MD
— 410-944 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-945 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-946 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-947 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-953 9XXX which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-954 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-955 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-956 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-957 7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 POCOMOKE MD
— 410-962 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-964 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-965 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-966 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-968 5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CRISFIELD MD
— 410-969 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD
— 410-974 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-975 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-981 3XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-983 1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-986 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-987 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.