NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 620-962 not yet reported which blocks → KANOKLA TEL ASSN 1788 FREEPORT KS
— 620-963 9XXX which blocks → UNITED TEL OF EASTERN KANSAS DBA CENTURYLINK 1810 NEOSHO FLS KS
— 620-964 9XXX which blocks → UNITED TEL OF EASTERN KANSAS DBA CENTURYLINK 1810 LEROY KS
— 620-965 none assigned yet which blocks → SOUTHERN KANSAS TEL. CO., INC. 1833 LATHAM KS
— 620-967 not yet reported which blocks → KANOKLA TEL ASSN 1788 BLUFF CITY KS
— 620-968 0XXX3XXX4XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WELLINGTON KS
— 620-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX KS
— 620-982 2XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PAWNEEROCK KS
— 620-983 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PEABODY KS
— 620-984 not yet reported which blocks → KANOKLA TEL ASSN 1788 WALDRON KS
— 620-986 not yet reported which blocks → WHEAT STATE TEL., INC. 1847 ROCK KS
— 620-995 6XXX7XXX8XXX · 2 holders which blocks → UNITED TEL OF EASTERN KANSAS DBA CENTURYLINK 1810 BELPRE KS
— 621-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 621-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-700 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-950 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-958 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-959 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 621-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 623-209 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PHOENIX AZ
— 623-210 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 623-214 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 623-217 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-218 3XXX6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 623-221 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-245 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 623-247 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 623-256 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 623-261 0XXX which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-266 not yet reported which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 623-293 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 623-297 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-298 8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 623-306 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H PHOENIX AZ
— 623-308 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 623-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 623-312 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 623-321 not yet reported which blocks → ONVOY, LLC - AZ 630E PHOENIX AZ
— 623-322 not yet reported which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 623-326 not yet reported which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 623-327 9XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 623-328 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.