One specific goal of this website is to be a clearing house of DSC Groups. Hopefully, anyone assigning a new Group will review this list of known Groups, so the same Group numbers are not assigned in the same geographic area. Below is a link to a spreadsheet of Group numbers known to the author at this time, primary location of such Groups and a phrase of how that number relates to the organization using that group.
If you would like your Group number listed, or if your organization wants to be removed from this list, please go to the Contact Us page and send a message.
I have recently learned there are recommendations for assigning Group numbers. I’m not convinced this is cast in stone, but some DSC radio owners manuals have verbiage such as “USCG recommends programming the MID of a ships MMSI into the second, third and fourth digits of the group MMSI as it denotes the area the ship is located in, the last 5 digits are decided upon by persons in the group”. I have also read some webpages saying in the USA only FCC (366, 367 MID numbers) can be used after the leading zero in Group numbers and non-FCC (in the USA 338) cannot be used. Some webpages also say a ship’s FCC MMSI number needs to be used for a Group number. These webpages say the trailing zero should be moved to the beginning of the Group number. An example of what I have read say if my MMSI number were 366123450, the trailing zero would be moved to the beginning so my Group number would be 036612345. This scheme does not allow one person to assign multiple Group numbers, even though they may belong to multiple organizations and help them define Group numbers. After searching the web quite extensibility, I have not found any official documents stating these conventions. I interpret “recommends” as not an absolute requirement. Therefore, some Group numbers I have been involved with do not start with 366, 367 nor 338. Considering there are nearly 100 million (0 – 099,999,999) combinations, I don’t see much of a chance of duplicate Group numbers within very roughly 25-50 miles of each other, so have used easy-to-remember numbers for Groups.