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 920
FRONTIER NORTH INC. - WI 42
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
2001-06-18 920-355 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 MAPLETON WI
2001-06-18 920-368 2XXX3XXX4XXX6XXX which blocks → FRONTIER NORTH INC. - WI 0886 NEOSHO WI
2001-06-12 920-276 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 THERESA WI
2001-06-08 920-844 4XXX6XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 BRILLION WI
— 920-269 0XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 LOMIRA WI
— 920-349 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 HUSTISFORD WI
— 920-474 1XXX5XXX6XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 MAPLETON WI
— 920-477 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 EDEN WI
— 920-478 0XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 WATERLOO WI
— 920-488 0XXX1XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 THERESA WI
— 920-526 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 GREENBUSH WI
— 920-528 3XXX4XXX5XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 CASCADE WI
— 920-533 0XXX1XXX2XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 CAMPBELSPT WI
— 920-564 0XXX1XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 OOSTBURG WI
— 920-583 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 OAKFIELD WI
— 920-625 0XXX1XXX6XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 NEOSHO WI
— 920-648 0XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 LAKE MILLS WI
— 920-668 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 CEDARGROVE WI
— 920-696 2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 CLYMAN WI
— 920-732 2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 WHITELAW WI
— 920-753 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 MT CALVARY WI
— 920-754 2XXX3XXX6XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 REEDSVILLE WI
— 920-755 0XXX1XXX5XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 MISHICOT WI
— 920-756 none assigned yet which blocks → FRONTIER NORTH INC. - WI 0886 BRILLION WI
— 920-793 0XXX which blocks → FRONTIER NORTH INC. - WI 0886 TWO RIVERS WI
— 920-794 0XXX4XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 TWO RIVERS WI
— 920-795 1XXX5XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 JOHNSBURG WI
— 920-823 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 JACKSONPT WI
— 920-839 0XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 BAILEYSHBR WI
— 920-847 0XXX1XXX4XXX5XXX7XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 WASHIGTNIS WI
— 920-849 0XXX which blocks → FRONTIER NORTH INC. - WI 0886 CHILTON WI
— 920-853 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 HILBERT WI
— 920-854 0XXX3XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 SISTER BAY WI
— 920-868 0XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 EGG HARBOR WI
— 920-876 6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 ELKHART LK WI
— 920-892 0XXX1XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 PLYMOUTH WI
— 920-893 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 PLYMOUTH WI
— 920-894 0XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 KIEL WI
— 920-898 0XXX3XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 NEWHOLSTEN WI
— 920-925 1XXX2XXX4XXX5XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 LEBANON WI
— 920-994 0XXX1XXX3XXX5XXX6XXX7XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 RANDOMLAKE WI
— 920-999 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 ST CLOUD WI

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.