By asking directly is a very good way (I mean, I guess it's recommended to vote for witnesses that you know that are real and actually answer your questions :-) )
Latest release (1.27.11) had those "initial" seed nodes compiled in:

seed.hive.blog:2001             # blocktrades
seed.openhive.network:2001      # gtg
hive-seed.roelandp.nl:2001      # roelandp
hive-seed.arcange.eu:2001       # arcange
anyx.io:2001                    # anyx
hived.splinterlands.com:2001    # splinterlands
hive-api.3speak.tv:2001         # threespeak
node.mahdiyari.info:2001        # mahdiyari
hive-seed.lukestokes.info:2001  # lukestokes.mhth
seed.deathwing.me:2001          # deathwing
hive-seed.actifit.io:2001       # actifit
seed.shmoogleosukami.co.uk:2001 # shmoogleosukami
hiveseed.rishipanthee.com:2001  # rishi556

Source: https://github.com/openhive-network/hive/blob/1.27.11/doc/seednodes.txt