gct.co

Valid Email Server
Domain Lookup › gct.co
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
gct.co
Yes
✓ Yes
Barracuda
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-09-23 11:28:58 UTC · ↺ Refresh

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MX Hostnames

  • d217161.a.ess.uk.barracudanetworks.com
  • d217161.b.ess.uk.barracudanetworks.com

MX Priorities

  • d217161.a.ess.uk.barracudanetworks.com: 10
  • d217161.b.ess.uk.barracudanetworks.com: 10

A / AAAA Records

  • 104.20.35.121 (no PTR)
  • 172.66.148.68 (no PTR)
  • 2606:4700:10::6814:2379 (no PTR)
  • 2606:4700:10::ac42:9444 (no PTR)

Mail Server IPs

  • 18.133.136.188 ↩ mail.ess.uk.barracuda.com
  • 18.133.136.187 ↩ mail.ess.uk.barracuda.com
  • 18.133.136.186 ↩ mail.ess.uk.barracuda.com

SOA Record

Raw SOA harmony.ns.cloudflare.com dns.cloudflare.com 2413662208 10000 2400 604800 1800
Primary NS (mname)
harmony.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2413662208
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

harmony.ns.cloudflare.com
vicky.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 include:aspmx.pardot.com include:spf-uk.emailsignatures365.com include:spf.ess.uk.barracudanetworks.com include:spf.protection.outlook.com ip4:51.68.210.255 -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✓ Reject
v=DMARC1; p=reject; fo=1; rua=mailto:[email protected]; ruf=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

12 records
  • knowbe4-site-verification=5faec781db0b4e8ce145ac58bf0ca0e3
  • pardot1111333=1029c7507c5fc0f0bbd7c2ffc9dbbd9033e497bb2ebe6197b6cebdadfdc86cc5
  • sending_domain1111333=5102e4bca16f94907e09c390cbebd7f7fc5e3c9be0349b946855b43099516245
  • SPFv=spf1 include:aspmx.pardot.com include:spf-uk.emailsignatures365.com include:spf.ess.uk.barracudanetworks.com include:spf.protection.outlook.com ip4:51.68.210.255 -all
  • BPL=3927324
  • Bl9e8Ry1jAnnDo8raCm5VGq1+pQfj6kBaQRSKpu1SNbXVziSJYys2TghdVlC9RJCkBX8Oql+Bd519rTtjH3GMA==
  • Foxit-domain-verification=87b8f52e7290633247d100fa34f45e75
  • MS=ms81846047
  • anthropic-domain-verification-52xjvr=jAjjxNU1wCodNK53GZF0HWxRa
  • atlassian-domain-verification=Yq6XBSGbMf3a5GngT71Jguv6iWDHNAOUMiOFRcuAk5YaA3BaiCxW2UxRaK06dxuN
  • autodesk-domain-verification=5JRs0WcJAEgYWRIckYGC
  • google-site-verification=OLSbvEOwnwwzu7DRy6rs8tBOMjTH2W7FqYaKtvnVKzc
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