NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

21 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 307
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 20
ONVOY, LLC - WY 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2012-07-19 307-312-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F WSPEARFISH WY
2012-07-05 307-343-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 LARAMIE WY
2012-06-22 307-312-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F WSPEARFISH WY
2012-06-13 307-203-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 JACKSON WY
2012-06-07 307-514-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHEYENNE WY
2012-06-05 307-274-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F CHEYENNE WY
2012-05-14 307-797-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 CASPER WY
2012-05-07 307-201-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F JACKSON WY
2012-05-02 307-417-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RAWLINS WY
2012-05-02 307-431-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 WORLAND WY
2012-05-02 307-466-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GREENRIVER WY
2012-05-02 307-624-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DOUGLAS WY
2012-04-30 307-216-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F LUSK WY
2012-04-10 307-337-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 CASPER WY
2012-03-19 307-337-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CASPER WY
2012-02-29 307-828-5XXX 5000–5999Assigned ONVOY, LLC - WY 450F KEMMERER WY
2012-02-27 307-448-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 ROCK SPG WY
2012-02-07 307-363-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GILLETTE WY
2012-02-07 307-514-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHEYENNE WY
2012-01-30 307-278-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BUFFALO WY
2012-01-30 307-877-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 KEMMERER WY
2012-01-13 307-462-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 CASPER WY
2012-01-13 307-683-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 SHERIDAN WY
2012-01-10 307-344-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F MAMMOTH WY
2012-01-03 307-269-7XXX 7000–7999Assigned ONVOY, LLC - WY 450F WHEATLAND WY
2012-01-03 307-359-7XXX 7000–7999Assigned ONVOY, LLC - WY 450F DOUGLAS WY
2012-01-03 307-438-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F LANDER WY
2012-01-03 307-466-7XXX 7000–7999Assigned ONVOY, LLC - WY 450F GREENRIVER WY
2012-01-03 307-481-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F LUSK WY
2012-01-03 307-543-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F MORAN WY
2012-01-03 307-554-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F GLENROCK WY
2012-01-03 307-620-7XXX 7000–7999Assigned ONVOY, LLC - WY 450F BUFFALO WY
2012-01-03 307-677-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F EVANSTON WY
2012-01-03 307-699-6XXX 6000–6999Assigned ONVOY, LLC - WY 450F JACKSON WY
2012-01-03 307-735-8XXX 8000–8999Assigned ONVOY, LLC - WY 450F GLENDO WY
2011-12-28 307-543-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F MORAN WY
2011-12-16 307-248-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F AFTON WY
2011-12-01 307-298-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DOUGLAS WY
2011-12-01 307-313-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EVANSTON WY
2011-11-28 307-735-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F GLENDO WY
2011-11-03 307-271-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 POWELL WY
2011-11-03 307-337-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CASPER WY
2011-10-27 307-545-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F OLDFATHFUL WY
2011-09-20 307-369-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHEYENNE WY
2011-08-22 307-274-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - WY 081F CHEYENNE WY
2011-08-10 307-359-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 DOUGLAS WY
2011-07-29 307-269-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WHEATLAND WY
2011-07-18 307-337-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CASPER WY
2011-07-11 307-578-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 CODY WY
2011-07-06 307-365-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CHEYENNE WY

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.