NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
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
— 410-832 3XXX6XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-833 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-834 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WATERLO236 MD
— 410-835 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WILLARDS MD
— 410-836 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BEL AIR MD
— 410-837 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-838 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BEL AIR MD
— 410-839 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-840 1XXX6XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-841 0XXX4XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-842 3XXX5XXX7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 TOWSON MD
— 410-843 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
— 410-846 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 SEVERN MD
— 410-847 0XXX2XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-848 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WESTMINSTR MD
— 410-849 0XXX1XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 SHERWD FOR MD
— 410-850 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-851 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-852 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-853 7XXX which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-854 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-855 0XXX1XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.