Kastro Labs utility
Kastro Lookup
Understand any domain or IP. Find its owner, DNS records, and security details.
Free to use. No accounts or analytics.
WHOISDNSTLSSPF / DKIM / DMARCGeoIP
Try a lookup
What’s new
- A clearer workspace. Jump between result sections, filter DNS records, and expand only the cards you need.
- Pinned targets. Keep frequent lookups handy, group them into collections, and import or export your pins.
- Snapshot comparisons. Refresh a lookup and see what changed in DNS, TLS, registration, and mail policies.
- Accurate DNS TTLs. See the cache lifetime returned by the resolver, with clearer reporting when a lookup fails.
Also improved: URL input, one-click refresh, keyboard search, and SPF checks.