ADGA genetics (or is it goat lookup?) lists the tattoo sequence of the goats... I don't think you can search by herd tattoo... that would be really helpful if you could!
I think your best bet is going around and asking others if they have any goats with an ANA in the right ear, and asking who bred them.
Herd code doesn't always go along with herd name... Mine is 5806, for example. ANA COULD be the breeder's initials, nickname, etc...
Problem is, everybody has a tattoo sequence... One only hopes that they are a big enough breeder to find them this way, and that they're still 'in business'.