nucleussec.com

Valid Email Server
Domain Lookup › nucleussec.com

Domain Overview

DNS: ✓ 20d ago Checker: ✓ 20d ago
nucleussec.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-05-20 22:30:55 UTC · ↺ Refresh

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MX Hostnames

  • nucleussec-com.mail.protection.outlook.com

MX Priorities

  • nucleussec-com.mail.protection.outlook.com: 0

A / AAAA Records

  • 172.66.139.81 (no PTR)
  • 172.66.135.246 (no PTR)
  • 2606:4700:10::ac42:87f6
  • 2606:4700:10::ac42:8b51

Mail Server IPs

  • 52.101.11.17 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
  • 52.101.41.54 ↩ mail-sj2pr05cu00506.inbound.protection.outlook.com
  • 52.101.41.28 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com
  • 52.101.10.8 ↩ mail-bn1pr04cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:c902::4 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com
  • 2a01:111:f403:c902::2 ↩ mail-sj0pr03cu01602.inbound.protection.outlook.com
  • 2a01:111:f403:c801:: ↩ mail-sa9pr02cu00200.inbound.protection.outlook.com
  • 2a01:111:f403:f903:: (no PTR)

SOA Record

Raw SOA linda.ns.cloudflare.com dns.cloudflare.com 2404595642 10000 2400 604800 1800
Primary NS (mname)
linda.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2404595642
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

marty.ns.cloudflare.com
linda.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 ip4:50.240.121.10/29 ip4:64.226.136.52 ip4:52.203.170.67 include:spf.protection.outlook.com include:servers.mcsv.net include:spf.mandrillapp.com include:_spf.psm.knowbe4.com include:5738249.spf07.hubspotemail.net include:amazonses.com -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

~ Quarantine
v=DMARC1; p=quarantine; pct=100; adkim=r; aspf=r; rua=mailto:[email protected],mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]

DKIM Selectors

✓ 6 found
selector1._domainkey
selector2._domainkey
mail._domainkey
k1._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

21 records
  • MS=ms88452359
  • gamma-domain-verification-k84vrv=lYbVN8RZCfOIVeeOeN4s5bMIW
  • ca3-10948bc78e15435dbcae674c1fbeed82
  • apple-domain-verification=Xe69PNl7CTtoLUhy
  • rillet-domain-verification-4qc536=gPdCOekybe8Eg2Dd1KjDZLbnw
  • google-site-verification=AHPBdWDsdyyg0Hj62GSlTgU4jlaC836TEP-FKDaU1X4
  • google-site-verification=45zsKIK3E-tdaUifwbC6xmKkrhavkznhzfXERsaY-vU
  • atlassian-domain-verification=pkadKMv2aXpOtHv7ByhlP02ACTATuIKXdFYTRBrZ21j5SRub9/mSBvLdKUB9yXcB
  • 51B7C7CAC7
  • zapier-domain-verification-challenge=197bb98a-747a-414f-aae1-4ae77bccd6fb
  • anthropic-domain-verification-hxa5eb=fK6PGDVDoCeexPSO6fBrFStbH
  • amazonses:qkZ3lnP516Ya6Sfv7Mm4LADk+8vlzilTzYKUqHEoj08=
  • notion-domain-verification=u68nlXGM9HqPNiETxgHeVERbGQWSHmJUPUYwJ39UN7b
  • linkedin-site-verification=a6287060-cf04-4d38-8f6d-89f4d5d80edf
  • cloudflare_dashboard_sso=59847b29ca024f22004ec03cdf7785e2
  • Smb-vcALJx8czSqT-fQaVA5gmW8P
  • pandadoc-domain-verification=zX4ooDQ9iCZam7E6nSwa56
  • SPFv=spf1 ip4:50.240.121.10/29 ip4:64.226.136.52 ip4:52.203.170.67 include:spf.protection.outlook.com include:servers.mcsv.net include:spf.mandrillapp.com include:_spf.psm.knowbe4.com include:5738249.spf07.hubspotemail.net include:amazonses.com -all
  • brevo-code:c5a45a88154fbe42fd02c49370162db0
  • cursor-domain-verification-nf3fge=TDWuPKSBsOOKr0r9YsiYryOvr
  • openai-domain-verification=dv-N9S03KJjpcEbiWkKY68aEKvx
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