NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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
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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 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.