Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
nucleus.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 11:53:36 UTC · ↺ Refresh
MX Hostnames
- mail-mx-01.fibernetics.ca
- mail-mx-02.fibernetics.ca
MX Priorities
- mail-mx-02.fibernetics.ca: 10
- mail-mx-01.fibernetics.ca: 10
A / AAAA Records
- 199.127.109.135 (no PTR)
Mail Server IPs
- 208.85.217.141 ↩ mailpool-mx-02.fibernetics.ca
- 208.85.217.140 ↩ mailpool-mx-01.fibernetics.ca
SOA Record
Raw SOA
dns1.nucleus-hosting-zones.com myoung.corp.fibernetics.ca 2026031602 10800 3600 1209600 10800
Primary NS (mname)
dns1.nucleus-hosting-zones.com
Admin Email (rname)
myoung@corp.fibernetics.ca
Serial
2026031602
Refresh
10800s
Retry
3600s
Expire
1209600s
Minimum TTL
10800s
Nameservers (NS)
dns5.nucleus-hosting-zones.com
dns2.nucleus-hosting-zones.com
dns1.nucleus-hosting-zones.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf.fibernetics.ca include:mail.zendesk.com include:spf.cust-smarthosts.fibernetics.ca ip4:208.85.222.116 ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate 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
✓ 3 found
mail._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
6 records- cisco-ci-domain-verification=33fe6f88923e8a55b59815268ccafb8ca9459b35b7a6df361db77ac8338c22b4
- oneuptime-verification-TdUJRMuYGNfIsWwmRkYV
- SPFv=spf1 include:spf.fibernetics.ca include:mail.zendesk.com include:spf.cust-smarthosts.fibernetics.ca ip4:208.85.222.116 ~all
- yahoo-verification-key=Zb8QtrWI1gKAl38/IMREPlU94sFX1sJ/JTd6n5Rwcn4=
- MS=ms19884875
- google-site-verification=HVrWQvzK8unO236hDahNobzIqCLdW0TjckogeoJqnpc
Full email verification for nucleus.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits