NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
— 307-858 not yet reported which blocks → UNION TELEPHONE COMPANY 013B RIVERTON WY
— 307-859 0XXX which blocks → CENTURYTEL OF WYOMING, INC. DBA CENTURYLINK 2299 DANIEL WY
— 307-864 not yet reported which blocks → RT COMMUNICATIONS 3410 THERMOPOLS WY
— 307-867 not yet reported which blocks → TRI-COUNTY TEL. ASSN., INC. 2296 HAMITNDOME WY
— 307-868 not yet reported which blocks → TRI-COUNTY TEL. ASSN., INC. 2296 MEETEETSE WY
— 307-870 not yet reported which blocks → UNION TELEPHONE COMPANY 013B GREENRIVER WY
— 307-871 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 GREENRIVER WY
— 307-872 not yet reported which blocks → QWEST CORPORATION 9636 GREENRIVER WY
— 307-874 not yet reported which blocks → UNION TEL. CO. 2297 MANILA WY
— 307-875 not yet reported which blocks → QWEST CORPORATION 9636 GREENRIVER WY
— 307-876 not yet reported which blocks → RT COMMUNICATIONS 3410 SHOSHONI WY
— 307-877 7XXX8XXX which blocks → QWEST CORPORATION 9636 KEMMERER WY
— 307-878 not yet reported which blocks → RANGE TEL COOP INC 2251 SO ALZADA WY
— 307-883 not yet reported which blocks → SILVER STAR TEL CO INC 2295 FREEDOM WY
— 307-884 not yet reported which blocks → UNION TELEPHONE COMPANY 013B AFTON WY
— 307-885 not yet reported which blocks → SILVER STAR TEL CO INC 2295 AFTON WY
— 307-886 2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 AFTON WY
— 307-890 not yet reported which blocks → UNION TELEPHONE COMPANY 013B FREEDOM WY
— 307-896 not yet reported which blocks → QWEST CORPORATION 9631 WBLLFOURCH WY
— 307-899 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CODY WY
— 307-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WY
— 307-920 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 CHEYENNE WY
— 307-921 3XXX4XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 THERMOPOLS WY
— 307-922 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 ROCK SPG WY
— 307-939 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 WRIGHT WY
— 307-941 2XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 NEWCASTLE WY
— 307-949 4XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 NEWCASTLE WY
— 307-950 not yet reported which blocks → WY
— 307-958 not yet reported which blocks → WY
— 307-959 not yet reported which blocks → WY
— 307-970 not yet reported which blocks → WY
— 307-976 not yet reported which blocks → WY
— 307-977 not yet reported which blocks → UNION TELEPHONE COMPANY 013B LARAMIE WY
— 307-988 not yet reported which blocks → WY
— 307-995 none assigned yet which blocks → QWEST CORPORATION 9636 CASPER WY
— 307-996 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WY 450F CHEYENNE WY
— 308-210 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J GRAND IS NE
— 308-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 308-220 1XXX8XXX9XXX · 3 holders which blocks → UNITED TEL CO OF THE WEST DBA CENTURYLINK - NE 4530 SCOTSBLUFF NE
— 308-221 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 NO PLATTE NE
— 308-226 not yet reported which blocks → NEBRASKA CENTRAL TEL. CO. 1574 DANNEBROG NE
— 308-228 not yet reported which blocks → ELSIE COMMUNICATIONS, INC. 1518 ELSIE NE
— 308-232 not yet reported which blocks → GREAT PLAINS COMMUNICATIONS, INC. 1577 MIRAGEFLTS NE
— 308-233 none assigned yet which blocks → CITIZENS TELECOM OF NE LLC DBA FRONTIER COM OF NE 1128 KEARNEY NE
— 308-234 not yet reported which blocks → CITIZENS TELECOM OF NE LLC DBA FRONTIER COM OF NE 1128 KEARNEY NE
— 308-235 none assigned yet which blocks → UNITED TEL CO OF THE WEST DBA CENTURYLINK - NE 4530 KIMBALL NE
— 308-236 not yet reported which blocks → CITIZENS TELECOM OF NE LLC DBA FRONTIER COM OF NE 1128 KEARNEY NE
— 308-237 not yet reported which blocks → CITIZENS TELECOM OF NE LLC DBA FRONTIER COM OF NE 1128 KEARNEY NE
— 308-238 8XXX which blocks → CITIZENS TELECOM OF NE LLC DBA FRONTIER COM OF NE 1128 KEARNEY NE
— 308-239 3XXX8XXX · 2 holders which blocks → CONSOLIDATED TELCO, INC. 1530 PAXTON NE

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.