Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
substackinc.com
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 05:53:49 UTC · ↺ Refresh
MX Hostnames
- aspmx2.googlemail.com
- aspmx3.googlemail.com
- alt2.aspmx.l.google.com
- aspmx.l.google.com
- alt1.aspmx.l.google.com
MX Priorities
- alt1.aspmx.l.google.com: 5
- alt2.aspmx.l.google.com: 5
- aspmx.l.google.com: 1
- aspmx2.googlemail.com: 10
- aspmx3.googlemail.com: 10
A / AAAA Records
- 16.15.185.86 (no PTR)
- 54.231.195.85 ↩ s3-website-us-east-1.amazonaws.com
- 16.15.212.149 (no PTR)
- 54.231.202.229 ↩ s3-website-us-east-1.amazonaws.com
- 16.15.183.46
- 54.231.161.77
- 54.231.195.117
- 16.15.183.1
Mail Server IPs
- 108.177.123.26 ↩ lcscld-in-f26.1e100.net
- 2800:3f0:4003:c0f::1a (no PTR)
- 172.253.116.26 ↩ dj-in-f26.1e100.net
- 2a00:1450:400b:c02::1b ↩ dj-in-f27.1e100.net
- 142.251.16.27 ↩ bl-in-f27.1e100.net
- 2607:f8b0:4004:c07::1b ↩ bc-in-f27.1e100.net
SOA Record
Raw SOA
ns-97.awsdns-12.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-97.awsdns-12.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-1489.awsdns-58.org
ns-1889.awsdns-44.co.uk
ns-856.awsdns-43.net
ns-97.awsdns-12.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; sp=none; aspf=r;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none
DKIM Selectors
✓ 3 found
google._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: google
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
19 records- airtable-verification=01b9b4ddd909b71412a3202e3a643336
- canva-site-verification=54_ahD3uULqGa7P_0jvf8Q
- ZOOM_verify_KsDzODtfRdu4v2vGYNKXdT
- SPFv=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all
- anthropic-domain-verification-zqj21r=y9UFSUQUQwDqSWfG9qpYtHjyi
- atlassian-domain-verification=TsJmVEBkwy3OrVkBBkpJxoSIJxGspg6OCoSzDVseqdKomePw08H5FZ5YHFBsaY3W011701
- stripe-verification=0d8291ed610a18bb46decf9707ba372f0fedb381eca45e7d2d4724080ee6d969
- cursor-domain-verification-wak9g9=qlox59bVLTBidjpUr228HUNT3
- stripe-verification=364EE20750CB1E599CE17652B4F2D2FC288C9DB0F4128CBDAE5BB75810965A89
- mgverify=6069bdc80667d0adec3b56c3bf9fc7e88f7f26bba5f7b1b6f595226ab0acbe24
- notion_verify_&iQelBCUSlv^ofG#
- zapier-domain-verification-challenge=3cb68805-3622-4d34-aa93-007f1c945ac4
- apple-domain-verification=AVZ3KJOwUetRmt7z
- hcp-domain-verification=ad8fbaad965b1e249489ade97b5ac913e5b6a1cc244e7f67acb9c1c8cf12dc03
- openai-domain-verification=dv-gF9cE4Anz6NduBJIMWtyllAA
- 1password-site-verification=TUDGGIQHGRHTTKAJOJC4L4ZMEY
- loom-site-verification=faba7f9cb0dc41479c85e4cdc6e01c85
- MS=ms61801157
- bitrise-verification=82dc7da039e8378b-9la20MIeuPF-
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