substack.com
The domain substack.com answers at IP address 172.64.150.56. The domain DNS is managed by Cloudflare, which decides where each subdomain points. Mail for substack.com goes through 2 servers; the highest priority one is mxa.mailgun.org. It also publishes 9 TXT records, used to verify domain ownership with external services and to configure mail security through SPF, DKIM and DMARC.
A A records
- 172.64.150.56 300s
- 104.18.37.200 300s
AAAA AAAA records
MX MX records
- 10 mxa.mailgun.org 240s
- 10 mxb.mailgun.org 240s
NS NS records
- ali.ns.cloudflare.com 21600s
- lee.ns.cloudflare.com 21600s
TXT TXT records
- tiktok-developers-site-verification=7PgqCAJ52ILLOqf2KELd8uaRfJpuzaLQ 300s
- google-site-verification=SXEl7_p4SBszcanSWwVc_3-RFky80c0-94janbeeWI4 300s
- google-site-verification=4V_X38Yf0J4VJcWFwtG38bOS1nkOWeIWJhticlMgNQE 300s
- google-site-verification=DAkdykID6WqQM6tT7IfSu9_uB7-qIdB039MA_C3T3eA 300s
- tiktok-developers-site-verification=A9XRSo8lWy5CPFJ0bqI04KCpUZGAAq7p 300s
- facebook-domain-verification=8vbxp2ntmkudc6is3h5r840c9fwo7f 300s
- v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all 300s
- google-site-verification=FfNIQIxsRHpj3Y7E_d3N6GFqGgWDZ-sfYojqCilwtqE 300s
- google-site-verification=vQEKLOUDfKNOQAv9W3EUMiRD6e5ibAEPhc2yCzP7big 300s
SOA SOA records
- ali.ns.cloudflare.com 217s
What each record means
- A and AAAA: the server IP address, in IPv4 and IPv6.
- MX: the servers that receive the domain mail. The number is the priority; the lowest is tried first.
- NS: the name servers, which have the final say over the domain DNS.
- TXT: free text. Mostly used for SPF, DKIM and DMARC, and to verify ownership with third parties.
- TTL: how many seconds the record may be cached before asking again.
Checked 3 hours ago.