NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 307
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 2
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
2021-11-05 307-408 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LYMAN WY
2021-11-05 307-423 0XXX1XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F BUFFALO WY
2021-11-03 307-384 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMMIO, LLC 939H AFTON WY
2021-10-28 307-291 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H CODY WY
2021-10-20 307-396 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F GREENRIVER WY
2021-10-01 307-387 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F GILLETTE WY
2021-08-11 307-376 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALPINE WY
2021-08-11 307-395 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F LARAMIE WY
2021-07-14 307-346 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHEYENNE WY
2021-05-21 307-394 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CASPER WY
2021-04-23 307-381 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F SHERIDAN WY
2021-04-23 307-910 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WY 450F CHEYENNE WY
2021-03-31 307-393 0–9 XXXall 10 · 3 holders which blocks → AIRUS, INC. - WY 581H EVANSTON WY
2021-03-05 307-305 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDWEST WY
2021-03-05 307-361 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BAGGS WY
2021-03-02 307-293 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WY 450F GUERNSEY WY
2021-02-28 307-667 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WY 450F RAWLINS WY
2021-02-10 307-368 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 AFTON WY
2021-02-05 307-445 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → ONVOY, LLC - WY 450F KEMMERER WY
2021-02-05 307-500 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WY 450F BORDER WY
2021-02-05 307-556 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WY 450F RIVERTON WY
2021-01-15 307-318 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F WRIGHT WY
2020-12-21 307-306 0–9 XXXall 10 · 6 holders which blocks → STRATUS NETWORKS 495J DOUGLAS WY
2020-11-09 307-303 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F GREENRIVER WY
2020-09-17 307-304 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 JEFFREY CY WY
2020-09-17 307-319 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SHOSHONI WY
2020-09-02 307-225 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LARAMIE WY
2020-08-17 307-302 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WY 081F CODY WY
2020-08-10 307-372 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WY 450F DOUGLAS WY
2020-08-10 307-407 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WY 450F WSPEARFISH WY
2020-07-29 307-355 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LA GRANGE WY
2020-06-17 307-292 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J CHEYENNE WY
2020-06-10 307-900 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H GLENDO WY
2020-05-21 307-285 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - WY 581H BUFFALO WY
2020-05-07 307-770 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ALL WEST/WYOMING, INC. 3880 FARSON WY
2020-04-03 307-210 0XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SOUTHESRDN WY
2020-04-03 307-236 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BURNS WY
2020-01-24 307-400 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J CHEYENNE WY
2019-11-20 307-284 0–9 XXXall 10 · 5 holders which blocks → SILVER STAR TELEPHONE COMPANY, INC. - WY 110G JACKSON WY
2019-10-23 307-310 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHEYENNE WY
2019-10-16 307-263 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J CHEYENNE WY
2019-10-10 307-300 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WY 450F POWELL WY
2019-08-13 307-218 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WY 450F SHERIDAN WY
2019-07-22 307-323 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2019-07-22 307-336 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DANIEL WY
2019-07-22 307-456 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BIG PINEY WY
2019-06-18 307-443 3XXX4XXX5XXX6XXX · 2 holders which blocks → COMMIO, LLC 939H CHEYENNE WY
2019-05-23 307-666 0XXX4XXX6XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H CHEYENNE WY
2019-05-15 307-244 0XXX4XXX · 2 holders which blocks → SILVER STAR TEL CO INC 2295 FREEDOM WY
2018-12-06 307-207 0–9 XXXall 10 · 3 holders which blocks → AIRUS, INC. - WY 581H LAKE WY

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.