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 903
VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 26
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
2015-02-18 903-403 0–9 XXXall 10 · 4 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 GARY TX
2015-02-18 903-418 0–9 XXXall 10 · 4 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 DETROIT TX
— 903-322 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BUFFALO TX
— 903-344 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 LEONA TX
— 903-362 none assigned yet which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 RICHLAND TX
— 903-389 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 FAIRFIELD TX
— 903-478 7XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 SLOCUM TX
— 903-529 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MARQUEZ TX
— 903-536 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 CENTERVL TX
— 903-543 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 SIMMS TX
— 903-545 5XXX7XXX · 2 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 OAKWOOD TX
— 903-547 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 HOOKS TX
— 903-585 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MAUD TX
— 903-599 none assigned yet which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 STREETMAN TX
— 903-632 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BOGATA TX
— 903-652 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 DEPORT TX
— 903-671 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 REDWATER TX
— 903-673 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 PURDON TX
— 903-674 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 DETROIT TX
— 903-679 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 KARNACK TX
— 903-684 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 AVERY TX
— 903-685 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 GARY TX
— 903-764 none assigned yet which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 ELKHART TX
— 903-789 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 UNCERTAIN TX
— 903-925 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BAGWELL TX
— 903-966 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 NEGLEY 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.