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 281
GRANDE COMMUNICATIONS NETWORKS, INC. - TX 24
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
2006-01-05 281-912 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HSTNSUBURB TX
— 281-220 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HOUSTON TX
— 281-301 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 BAMMEL TX
— 281-302 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SUGAR LAND TX
— 281-318 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HUMBLE TX
— 281-404 3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HOUSTON TX
— 281-410 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 STAFFORD TX
— 281-503 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 PORTER HTS TX
— 281-601 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 PORTER TX
— 281-666 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 CROSBY TX
— 281-678 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 DICKINSON TX
— 281-688 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HIGHLANDS TX
— 281-712 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 KATY TX
— 281-715 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 DEER PARK TX
— 281-750 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 RICHMNRNBG TX
— 281-751 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 MONTBLVIEU TX
— 281-761 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 CLEVELAND TX
— 281-762 0XXX1XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 RICHMNRNBG TX
— 281-764 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HUFFMAN TX
— 281-767 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 ROSHARON TX
— 281-803 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 TOMBALL TX
— 281-828 5XXX which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 BARKER TX
— 281-903 0XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SUGAR LAND TX
— 281-972 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 ARCOLA TX

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.