IP History shows a free A/AAAA passive-DNS sample for 3b9e39us-den6190-uscom.d9246951-d123-4dac-941b-50c9be8aa169.4c8ae1c52a5a.i2.checkpoint.com after security verification. For broader DNS search, export and API access, open Profundis. You can also browse domains or learn more.