NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 410-856 1XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-857 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WESTMINSTR MD
— 410-859 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-860 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-861 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 WESTMINSTR MD
— 410-862 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WATERLO236 MD
— 410-863 2XXX3XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-864 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
— 410-865 0XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-866 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-867 5XXX which blocks → VERIZON MARYLAND, INC. 9212 WEST RIVER MD
— 410-868 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-869 2XXX5XXX6XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-871 4XXX5XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WESTMINSTR MD
— 410-872 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-873 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 NANTICOKE MD
— 410-874 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 ODENTON MD
— 410-875 7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 SYKESVILLE MD
— 410-876 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-877 4XXX5XXX6XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FALLSTON MD
— 410-878 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
— 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
— 410-881 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 SHERWD FOR 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
— 410-890 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-891 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COCKEYSVL 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
— 410-894 not yet reported which blocks → SPOK, INC. 6630 TOWSON 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
— 410-899 not yet reported which blocks → SPOK, INC. 6630 TOWSON 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
— 410-903 none assigned yet which blocks → METROPCS, INC. 5562 SEVERNA PK MD
— 410-904 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WATERLO238 MD
— 410-905 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-906 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-907 1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WOODLAWN MD
— 410-908 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.