NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
2021-10-20 720-824 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D HUDSON CO
2021-09-24 720-817 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J STRASBURG CO
2021-09-07 720-814 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DEER TRAIL CO
2021-08-30 720-655 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2021-05-27 720-850 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J DENVER CO
2021-04-01 720-868 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CO 026D FORTLUPTON CO
2021-03-05 720-804 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LONGMONT CO
2021-03-05 720-813 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J DENVER CO
2021-02-24 720-806 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF COLORADO, LLC - CO 278F DECKERS CO
2021-01-25 720-844 0–9 XXXall 10 · 3 holders which blocks → LEAP TELECOM, LLC 616J DENVER CO
2021-01-21 720-736 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2021-01-14 720-803 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2021-01-08 720-823 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2021-01-06 720-821 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D LONGMONT CO
2020-12-31 720-784 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CO 026D GEORGETOWN CO
2020-12-11 720-796 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 478J GEORGETOWN CO
2020-11-24 720-756 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2020-11-24 720-781 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LONGMONT CO
2020-11-09 720-792 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-10-23 720-764 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CO 026D HUDSON CO
2020-10-15 720-760 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J DENVER CO
2020-10-05 720-912 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-09-21 720-743 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F LONGMONT CO
2020-09-11 720-742 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2020-09-03 720-769 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D DENVER CO
2020-08-27 720-807 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-08-24 720-714 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D LONGMONT CO
2020-08-19 720-741 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CO 026D GEORGETOWN CO
2020-08-19 720-802 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D FORTLUPTON CO
2020-08-18 720-790 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CO 026D ALLNSPKLYN CO
2020-08-17 720-615 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2020-08-17 720-752 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2020-07-13 720-706 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-06-19 720-703 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J DENVER CO
2020-06-04 720-680 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONGMONT CO
2020-05-11 720-734 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-04-21 720-798 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2020-03-31 720-704 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2020-03-27 720-702 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CO 026D KEENESBURG CO
2020-03-25 720-716 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2020-03-24 720-694 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2020-03-24 720-812 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2020-02-20 720-674 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2020-01-09 720-751 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2019-12-16 720-780 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2019-11-19 720-687 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2019-10-09 720-678 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J DENVER CO
2019-09-30 720-672 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2019-08-29 720-740 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J DECKERS CO
2019-08-23 720-673 0–9 XXXall 10 · 5 holders which blocks → EXIANT COMMUNICATIONS LLC 114J DENVER CO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.