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 619
T-MOBILE USA, INC. 96
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2024-03-26 619-986 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2024-02-29 619-903 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2024-01-11 619-257 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2022-07-14 619-853 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2022-01-14 619-983 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
2021-12-10 619-974 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-10-29 619-943 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-10-26 619-953 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LA JOLLA CA
2021-09-22 619-967 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2021-09-13 619-951 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
2021-08-23 619-949 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-05-21 619-939 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-03-17 619-907 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2021-03-04 619-918 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2021-02-25 619-657 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
2021-02-25 619-707 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2021-02-24 619-904 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-01-08 619-902 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2020-11-03 619-759 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2020-10-15 619-716 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2020-08-13 619-706 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2020-03-20 619-650 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2019-08-13 619-703 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2019-06-24 619-603 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2017-03-23 619-530 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2016-12-01 619-830 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2016-11-29 619-514 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2016-10-24 619-558 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2016-10-18 619-622 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2016-09-16 619-340 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
2016-08-26 619-480 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2016-08-12 619-404 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2016-06-29 619-513 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2015-09-22 619-317 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2015-09-16 619-751 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2015-07-23 619-484 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2015-06-16 619-762 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
2015-05-04 619-748 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2015-04-01 619-394 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2015-01-23 619-635 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2015-01-13 619-636 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2014-11-24 619-642 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2014-10-20 619-432 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2014-10-20 619-598 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2014-08-04 619-496 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2014-02-21 619-882 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2013-10-25 619-831 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2013-06-10 619-452 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2012-12-18 619-382 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2008-01-29 619-600 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA

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.