NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 956
STPCS JOINT VENTURE, LLC 144
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
2026-03-24 956-876 0XXX1XXX9XXX · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MERCEDES TX
2026-01-12 956-841 none assigned yet which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2026-01-05 956-834 0XXX1XXX2XXX which blocks → STPCS JOINT VENTURE, LLC 4290 PHARR TX
2025-12-09 956-829 9XXX which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2025-11-05 956-824 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2025-10-03 956-839 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2025-08-19 956-846 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2025-07-21 956-816 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2025-05-06 956-812 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 PHARR TX
2024-09-11 956-954 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2023-10-04 956-759 0XXX1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 RAYMONDVL TX
2023-04-19 956-828 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2022-10-03 956-680 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2022-08-02 956-769 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → STPCS JOINT VENTURE, LLC 4290 RAYMONDVL TX
2022-07-29 956-439 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
2022-07-26 956-315 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2022-03-03 956-751 0XXX1XXX8XXX9XXX · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 ZAPATA TX
2022-01-19 956-672 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2021-12-15 956-658 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2021-11-16 956-649 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
2020-09-04 956-656 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 ZAPATA TX
2020-09-02 956-576 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2020-09-01 956-575 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2020-08-28 956-558 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2020-01-14 956-484 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2019-01-10 956-301 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
2017-03-16 956-382 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2016-04-14 956-714 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2016-04-14 956-731 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2015-11-23 956-667 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2015-08-26 956-651 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2015-08-11 956-620 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2014-12-12 956-530 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2014-12-12 956-608 0–9 XXXall 10 · 6 holders which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
2014-11-21 956-801 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2014-10-07 956-520 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 WESLACO TX
2013-07-22 956-518 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2013-04-25 956-375 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 WESLACO TX
2012-11-26 956-360 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2010-12-29 956-270 0–9 XXXall 10 · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 EDINBURG TX
2010-12-29 956-402 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 PHARR TX
2009-04-16 956-293 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 BROWNSVL TX
2007-10-19 956-328 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2007-10-19 956-331 0–9 XXXall 10 · 6 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2007-10-19 956-354 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 PHARR TX
2007-07-13 956-923 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 SAN BENITO TX
2007-07-13 956-949 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
2007-06-01 956-890 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2007-05-17 956-598 0–9 XXXall 10 · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2007-05-02 956-626 0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 SAN BENITO TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.