An index of RN personnel from the early 1900’s until the inter war period of the 1920’s including the whole Great War.
From 1907 until October 1925 those joining the Royal Navy were allocated number is series of blocks with prefixes denoting the ratings classes.
Prefixes and their meanings:
Knowing the Branch of the Royal Navy your ancestor was in gives a very good indication of where they may have served on a ship and what their daily working life would have involved.
It is also notable that within this index only those numbers from 1907 until 1908 have no prefix, after 1908 as number blocks were in danger of spilling over into another branches allocation a prefix letter was added, so if in doubt -the letter prefix is the best indicator of a serviceman’s branch of the RN.
Seamen and Communicators 178001 to 240500 Prefix J
Engine room Artificers 268001 to 273000 Prefix K
Stokers 276001 to 313000 Prefix K
Artisans and Miscellaneous 340001 to 348000 Prefix M
Sick Bay staff and Ships Police [RPO'S] 350001 to 352000 Prefix M
Officers Stewards, Cooks and Boy Servants 353001 to 366450 Prefix L
These records are useful in that they also contain both service details and a date & place of birth, allowing those without one type of genealogical tracing clue with the other and enabling researchers to then search non-military or further military records.
Please be aware that due to the way we collate, and cross reference our databases, some records will contain more information than that listed above.
Original Source: Transcribed from the ADM188 Admiralty indices.