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
2013-04-02 720-525 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2013-04-02 720-724 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2013-03-15 720-580 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2013-03-01 720-613 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUDSON CO
2013-02-05 720-463 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CO 026D DECKERS CO
2013-02-05 720-590 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2013-02-04 720-723 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2013-02-01 720-380 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2013-01-28 720-360 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2013-01-17 720-638 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2013-01-04 720-370 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2012-12-20 720-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CO 026D LONGMONT CO
2012-12-13 720-737 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-12-03 720-386 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2012-11-16 720-552 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2012-11-16 720-634 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2012-11-15 720-408 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2012-11-15 720-502 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DENVER CO
2012-11-12 720-376 0–9 XXXall 10 · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2012-11-08 720-800 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2012-11-02 720-585 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2012-10-17 720-588 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G DENVER CO
2012-09-28 720-541 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-09-24 720-538 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2012-09-10 720-498 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-09-04 720-387 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2012-08-16 720-355 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-08-02 720-307 0–9 XXXall 10 · 3 holders which blocks → AT&T - LOCAL 7421 ALLNSPKLYN CO
2012-07-05 720-357 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2012-06-28 720-430 0–9 XXXall 10 · 3 holders which blocks → AT&T - LOCAL 7421 DENVER CO
2012-06-26 720-508 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2012-06-22 720-553 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 DENVER CO
2012-05-23 720-666 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF COLORADO, LLC - CO 278F DENVER CO
2012-03-06 720-627 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 DENVER CO
2012-03-02 720-729 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2012-02-17 720-623 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2012-02-13 720-599 0–9 XXXall 10 · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2012-01-03 720-465 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2011-12-12 720-428 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2011-11-22 720-409 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J DENVER CO
2011-11-21 720-245 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2011-11-16 720-491 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONGMONT CO
2011-10-31 720-474 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2011-10-04 720-414 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 ALLNSPKLYN CO
2011-09-23 720-469 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2011-09-20 720-625 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J DENVER CO
2011-08-12 720-606 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2011-08-12 720-708 0–9 XXXall 10 · 3 holders which blocks → TELIAX, INC. - CO 567G DENVER CO
2011-08-09 720-477 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CO 026D DENVER CO
2011-08-09 720-499 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 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.