dug

dug [options] domain [recordtype_]

dug is a command-line tool for checking DNS propagation across the globe. It queries multiple DNS resolvers worldwide to determine if a DNS record has propagated and shows response times from different geographic locations.
The tool is useful for verifying DNS changes after updating records, diagnosing DNS issues, and understanding how DNS caching affects record visibility. It can check various record types against a default set of public resolvers or custom ones.

-t, --type TYPE

Record type: A, AAAA, MX, TXT, NS, CNAME, SOA, PTR (default: A)

Comma-separated list of resolvers to query

Output results in JSON format

Output results in CSV format

Enable verbose output

Query timeout (default: 5)

Display help and exit

Display version and exit

Shows results from resolvers including:
- Resolver location/name
- Resolved IP(s) or record data
- Query response time
- Status indicator (match/differ)

Dependent on external DNS resolvers being available. Network latency affects query times. Some resolvers may rate-limit queries. Results show propagation trends but may not represent all geographic regions.

dug was developed to help system administrators and developers verify DNS changes have propagated globally before completing migrations or updates. It provides visibility into the distributed nature of DNS.

dig(1), nslookup(1), host(1), dog(1)