Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
ai-cathlon.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-14 07:49:05 UTC · ↺ Refresh
MX Hostnames
- mxw.263.net
- mx.263.net
MX Priorities
- mx.263.net: 10
- mxw.263.net: 5
A / AAAA Records
- 35.209.250.142 ↩ 142.250.209.35.bc.googleusercontent.com
Mail Server IPs
- 143.110.227.31 (no PTR)
- 164.92.126.242 (no PTR)
- 38.83.106.85 ↩ us-mx2.263.net
- 38.83.106.84 ↩ us-mx1.263.net
SOA Record
Raw SOA
dns17.hichina.com hostmaster.hichina.com 2026011209 3600 1200 86400 600
Primary NS (mname)
dns17.hichina.com
Admin Email (rname)
hostmaster@hichina.com
Serial
2026011209
Refresh
3600s
Retry
1200s
Expire
86400s
Minimum TTL
600s
Nameservers (NS)
dns18.hichina.com
dns17.hichina.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.263.net -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; fo=1; ruf=mailto:[email protected]; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✗ None detectedNo 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
2 records- SPFv=spf1 include:spf.263.net -all
- google-site-verification=hVmtT79njBeZTG31Eih9_gxYfLTqTUkMhzK9j-wAQOU
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for ai-cathlon.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits