This site tells you the shard firsts for your character or guild.
Prime/Vigil support is not in yet, but will be added soon after Trion adds it to the data dumps.
Data is checked for from Trion daily. The latest is dated 2018-10-16. All information is straight from Trion's public assets.
Enter a player name and/or a guild name, then press Submit.
See other RIFT tools here.