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You need to put in the herokudns.com address that the CNAME is pointing at – e.g. stark-wisteria-rnbgkawldfk6gq7m8308ytts.herokudns.com in our case.

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For me the securitytrails.com website just crashes. I put my DNS target: "stark-horse-mrp4jeowu9yvwpnnma32x6hd.herokudns.com", clicked "Run Check" and it seems to redirect to a failed (no CSS) webpage. Anyone else experiencing this?

EDIT: I MANAGED to make it work with this:

https://www.nslookup.io/

Make sure to go through all the tabs at the top (Cloudflare DNS, Google DNS) - for me they were all "no A records found". Only "Authoritative" gave me 3 A records which I successfully managed to use.

Yeah securitytrails.com was working for me, but went down about 10 mins ago.

That seems to happen when you put in a DNS target that doesn't have any records in SecurityTrails. In that case, it is best to use nslookup

Thanks so much, it worked for us.

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