Oceania · DX entity · DXCC 123

Johnston Island

Johnston Island is a DX entity in Oceania, in CQ zone 31 and ITU zone 61. Its primary prefix is KH3.

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Figure 1. Johnston Island and its first-level subdivisions. Hover for names; scroll to zoom. Boundaries: Natural Earth, Admin 0 Map Subunits and Admin 1 States and Provinces, 1:10m, version 5.1.2 (13 May 2022), public domain, retrieved 2026-10-15. https://www.naturalearthdata.com/. DX entity boundaries assembled by The DX Atlas Project from the sources named, one recipe row per DXCC entity (subunits matched, merged, split by box or carved from a parent; DXEntity-Recipe.md), 2026. At the full detail of the source; exported 30 October 2026. Projection: Lambert azimuthal equal-area centred on 16.7° N 169.5° W.

Data sheet

DXCC entity code	123
Name in the ADIF standard	JOHNSTON I.
Continent	Oceania
Primary prefix	KH3
CQ zone	31
ITU zone	61

Prefixes

KH3 is the primary prefix. The country files list 4 prefixes and prefix blocks for Johnston Island.

Show all prefixes

KH3 AH3 NH3 WH3

Sources: Jim Reisert AD1C, Big CTY country files, 15 September 2026. https://www.country-files.com/ (MIT licence); ADIF Development Group, ADIF Specification version 3.1.8 (2026-10-12), DXCC Entity Code enumeration. https://adif.org/; ARRL, DXCC List (current and deleted entities), January 2026. https://www.arrl.org/country-lists-prefixes; Flag: Flagpedia.net (flagcdn.com), SVG, public domain, retrieved 2026-10-10.