Europe · DX entity · DXCC 167

Market Reef

Market Reef is a DX entity in Europe, in CQ zone 15 and ITU zone 18. Its primary prefix is OJ0.

Flag of Åland.

The map of this entity arrives with the DXEntity boundary layer.

Figure 1. Market Reef. The boundary is to come. Boundaries: not yet published (GIS-Architecture, the DXEntity layer).

Data sheet

DXCC entity code	167
Name in the ADIF standard	MARKET REEF
Continent	Europe
Primary prefix	OJ0
CQ zone	15
ITU zone	18

Prefixes

OJ0 is the primary prefix. The country files list 1 prefix for Market Reef.

Show all prefixes

OJ0

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.