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
2017-11-21 720-667 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2017-11-14 720-768 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 022H DENVER CO
2017-10-27 720-527 0–9 XXXall 10 · 2 holders which blocks → TELIAX, INC. - CO 567G DENVER CO
2017-09-29 720-765 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2017-09-01 720-603 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2017-09-01 720-815 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J LONGMONT CO
2017-09-01 720-818 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2017-08-30 720-665 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2017-08-30 720-845 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2017-08-25 720-513 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2017-08-17 720-650 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2017-07-31 720-602 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2017-07-21 720-516 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 DENVER CO
2017-06-30 720-594 0–9 XXXall 10 · 3 holders which blocks → AIRUS, INC. - CO 019J DENVER CO
2017-06-21 720-795 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DENVER CO
2017-06-13 720-510 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2017-05-25 720-586 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DENVER CO
2017-05-15 720-908 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2017-04-03 720-631 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2017-03-16 720-607 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2017-03-16 720-791 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H GEORGETOWN CO
2017-03-15 720-996 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H DENVER CO
2017-01-11 720-693 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2017-01-06 720-788 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2016-12-20 720-758 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DENVER CO
2016-12-19 720-718 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 LONGMONT CO
2016-12-14 720-572 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2016-12-09 720-487 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H LONGMONT CO
2016-12-08 720-592 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-11-23 720-462 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2016-11-09 720-576 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2016-10-14 720-543 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF COLORADO, LLC - CO 278F DENVER CO
2016-09-15 720-591 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2016-09-07 720-710 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2016-08-31 720-534 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D LONGMONT CO
2016-08-29 720-676 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2016-08-23 720-546 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-08-23 720-787 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 DENVER CO
2016-08-23 720-919 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-08-16 720-531 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2016-08-10 720-759 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F LONGMONT CO
2016-05-13 720-520 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H DENVER CO
2016-05-10 720-595 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2016-05-09 720-512 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2016-03-16 720-419 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2016-03-01 720-571 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CO 026D ALLNSPKLYN CO
2016-01-11 720-597 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2015-12-22 720-461 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 DENVER CO
2015-12-18 720-925 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2015-12-16 720-728 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 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.