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 720
T-MOBILE USA, INC. 132
QWEST CORPORATION 103
NEW CINGULAR WIRELESS PCS, LLC 92
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 75
BANDWIDTH.COM CLEC, LLC - CO 55
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
— 720-907 5XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
— 720-909 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
— 720-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CO
— 720-913 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
— 720-917 4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-920 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
— 720-921 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
— 720-922 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-924 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 DECKERS CO
— 720-929 none assigned yet which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-931 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-932 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-933 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-934 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-935 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-936 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-937 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-938 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-939 not yet reported which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-940 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-941 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-942 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-943 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
— 720-944 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-945 9XXX which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-946 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-947 9XXX which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-949 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
— 720-950 not yet reported which blocks → CO
— 720-951 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
— 720-956 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-958 not yet reported which blocks → CO
— 720-959 not yet reported which blocks → CO
— 720-961 0XXX3XXX4XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
— 720-962 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-963 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-971 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-974 8XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
— 720-975 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
— 720-976 not yet reported which blocks → CO
— 720-977 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-979 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-980 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-981 not yet reported which blocks → QWEST CORPORATION 9636 DENVER CO
— 720-982 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-984 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-985 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-987 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-988 1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DENVER CO
— 720-989 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO

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.