Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
swctf.org
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 20:30:19 UTC · ↺ Refresh
MX Hostnames
- us-smtp-inbound-1.mimecast.com
- us-smtp-inbound-2.mimecast.com
MX Priorities
- us-smtp-inbound-2.mimecast.com: 10
- us-smtp-inbound-1.mimecast.com: 10
A / AAAA Records
- 162.159.140.127 (no PTR)
Mail Server IPs
- 170.10.128.242 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
SOA Record
Raw SOA
ns53.worldnic.com namehost.worldnic.com 125090315 10800 3600 604800 3600
Primary NS (mname)
ns53.worldnic.com
Admin Email (rname)
namehost@worldnic.com
Serial
125090315
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns54.worldnic.com
ns53.worldnic.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:_spf-ips1.swctf.org include:_spf-ips2.swctf.org include:_spf-ips3.swctf.org include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:sendgrid.net ~all
📊 DNS lookups: 6/10
~ Soft fail (~all) — moderate 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
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
6 records- ck93fivqsj23vpk9007llmnj98
- SPFv=spf1 include:_spf-ips1.swctf.org include:_spf-ips2.swctf.org include:_spf-ips3.swctf.org include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:sendgrid.net ~all
- apple-domain-verification=AunVCD5hLB306brc
- smartsheet-site-validation=UQZEsP3YK5dUOH0xsEQm35yBMXZTk0GT
- adobe-idp-site-verification=9772b8bce2b91553ff4fd8705f1e2bdd8457f628f60bd3a7a81b1b75a8c0b1bc
- MS=ms14997751
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