Domain Overview
DNS: ✓ 4d ago
Checker: ✓ 4d ago
51combo.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-06-18 17:29:15 UTC · ↺ Refresh
MX Hostnames
- mx1.larksuite.com
- mx3.larksuite.com
- mx2.larksuite.com
MX Priorities
- mx1.larksuite.com: 1
- mx3.larksuite.com: 10
- mx2.larksuite.com: 5
A / AAAA Records
- 47.129.19.210 ↩ ec2-47-129-19-210.ap-southeast-1.compute.amazonaws.com
Mail Server IPs
- 18.139.153.173 ↩ ec2-18-139-153-173.ap-southeast-1.compute.amazonaws.com
- 122.14.230.154 (no PTR)
- 101.126.58.223 (no PTR)
SOA Record
Raw SOA
ns7.alidns.com hostmaster.hichina.com 2026011209 3600 1200 86400 600
Primary NS (mname)
ns7.alidns.com
Admin Email (rname)
hostmaster@hichina.com
Serial
2026011209
Refresh
3600s
Retry
1200s
Expire
86400s
Minimum TTL
600s
Nameservers (NS)
ns8.alidns.com
ns7.alidns.com
SPF Record
✓ Strict (-all)
v=spf1 +include:spf.onlarksuite.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none;
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
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
3 records- _globalsign-domain-verification=wwe-ciSL-J8QZ2flY89OISTG4D1o1IcZA8D4I2xBnf
- SPFv=spf1 +include:spf.onlarksuite.com -all
- verification-code-site-App_lark=iD0wSt9Ac57HVe79k4kG
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 · Customize →
See demo & docs
Deep verification
Full email verification for 51combo.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits