// dns · propagation
sc.gov DNS Propagation
Compare DNS records for sc.gov across multiple DNS-over-HTTPS providers to check if changes have propagated. Mismatches indicate records are still propagating.
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sc.gov DNS Propagation Status
This tool queries sc.gov's DNS records from three independent DNS-over-HTTPS providers simultaneously: Cloudflare (1.1.1.1), Google (8.8.8.8), and DNS.SB. By comparing the results, you can determine whether DNS changes have propagated across major resolvers.
Records that match across all providers are fully propagated. Yellow-highlighted mismatches indicate records that differ between providers, which typically resolves within the TTL (Time to Live) period.
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How DNS Propagation Works
When you update a DNS record for sc.gov, the change first appears on the authoritative nameservers. Recursive resolvers around the world continue serving cached copies of the old record until their TTL expires.
Different resolvers may cache records for different durations, which is why sc.gov may appear to have different records depending on which DNS server you query. This tool checks three major public resolvers simultaneously.
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Interpreting sc.gov's Propagation Results
If all three providers return identical results for sc.gov, your DNS changes have fully propagated to major resolvers. Mismatches highlighted in yellow indicate that some providers still have cached old records.
To speed up propagation, lower the TTL of sc.gov's records before making changes. A TTL of 300 seconds (5 minutes) ensures most resolvers pick up changes within minutes rather than hours.