Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
firstonsite.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-29 15:17:39 UTC · ↺ Refresh
MX Hostnames
- firstonsite-com.mail.protection.outlook.com
MX Priorities
- firstonsite-com.mail.protection.outlook.com: 0
A / AAAA Records
- 141.193.213.21 (no PTR)
- 141.193.213.20 (no PTR)
Mail Server IPs
- 52.101.41.183 ↩ mail-byapr04cu00307.inbound.protection.outlook.com
- 52.101.10.5 ↩ mail-bn6pr04cu00105.inbound.protection.outlook.com
- 52.101.10.18 ↩ mail-bn8pr05cu00302.inbound.protection.outlook.com
- 52.101.11.17 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c946::2 ↩ mail-ch4pr04cu00102.inbound.protection.outlook.com
- 2a01:111:f403:f901::2 ↩ mail-bl2pr02cu00402.inbound.protection.outlook.com
- 2a01:111:f403:f804::1 ↩ mail-co1pr05cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c801:: ↩ mail-sa9pr02cu00200.inbound.protection.outlook.com
SOA Record
Raw SOA
dell.ns.cloudflare.com dns.cloudflare.com 2399852717 10000 2400 604800 1800
Primary NS (mname)
dell.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399852717
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
dell.ns.cloudflare.com
isaac.ns.cloudflare.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf.protection.outlook.com include:_u.firstonsite.com._spf.dmarcly.com ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; sp=none;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
k1._domainkey
✓ Public key: 392 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
15 records- ZOOM_verify_JsalGalbRq62UnHCcM9NkA
- adobe-idp-site-verification=fe80b06987d71e67ec4b86f6d5ca6fb6e908cbffc9d9f1316c0d1d77c2d0d874
- anthropic-domain-verification-ve681y=VncUSp2A5GRMLdcV2Pn54O6tL
- apple-domain-verification=TaGphyoxBWIUYF4W
- atlassian-domain-verification=5u/rpdD6OEafQvVdfn6vsY7XhxkUaVYnoJ7oP/NP2zG1ffd8coanXegrRVQRklQS
- canva-site-verification=PCH1mn-p8Iv3TQk2QMbh8Q
- ccisso=b9cab6f3-f707-4ee0-a91c-1d8bdab470ea
- docusign=d5c0a865-e32f-412a-9161-ab7f349ead07
- google-site-verification=AL7WevNpGTWDkrLk1OJ2v5RlBiiZ8UkA8wlq7RRNSaA
- google-site-verification=YSWemSnda_WfmhIynH4BNh9cO104PHh7O0WwQ81cJcQ
- have-i-been-pwned-verification=74188cac84274f86f9a5bfd4dfaed96a
- openai-domain-verification=dv-BK2VWVjnB9pSmkQGDuBWzxVk
- SPFv=spf1 include:spf.protection.outlook.com include:_u.firstonsite.com._spf.dmarcly.com ~all
- 2482592
- MS=ms66359887
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