IPv4 Addresses
opensource.com. 10 IN A 23.48.224.69 opensource.com. 10 IN A 23.48.224.75
IPv6 Addresses
opensource.com. 10 IN AAAA 2600:1402:8000:7:0:0:1700:A264 opensource.com. 10 IN AAAA 2600:1402:8000:7:0:0:1700:A26F
Name Servers
opensource.com. 1200 IN NS dns1.p01.nsone.net. opensource.com. 1200 IN NS dns2.p01.nsone.net. opensource.com. 1200 IN NS dns3.p01.nsone.net. opensource.com. 1200 IN NS dns4.p01.nsone.net.
Mail Servers
opensource.com. 1200 IN MX 10 mx1.redhat.com. opensource.com. 1200 IN MX 20 mx2.redhat.com.
SOA Details
opensource.com. 1200 IN SOA dns1.p01.nsone.net. hostmaster.nsone.net. 1669627888 200 7200 1209600 3600
Certificate Authority Authorization
No CAA records were returned at this registrable domain name. With no CAA policy, any public certificate authority (CA) may issue TLS certificates for names under this zone unless a parent publishes CAA; add issue / issuewild / iodef records to restrict issuance.
DMARC
Organizational policy (p): how receivers treat mail that fails aligned DMARC checks — none (monitor only), quarantine (often junk), or reject (block).
Subdomain policy (sp): when set, it applies to hostnames below this domain instead of p; if omitted, subdomains inherit the organizational policy.
pct: share of mail that gets quarantine/reject; 100 = all failing messages (default).
100Aggregate DMARC reports (ZIP/XML). Optional but recommended for visibility.
Forensic (per-failure) reports. Often omitted for privacy or volume.
opensource.com. 1200 IN DMARC v=DMARC1; p=reject; rua=mailto:[email protected]; sp=none; ri=86400
DKIM
No DKIM TXT with `v=DKIM1` was returned for the selector names we probe automatically.
SPF (Sender Policy Framework)
| Qualifier | Mechanism | Target / value | Valid | Details |
|---|---|---|---|---|
| + Pass | mx |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | include |
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| + Pass | include |
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| - Fail | all |
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opensource.com. 1200 IN TXT "v=spf1 mx ip4:66.187.233.33 ip4:66.187.233.34 ip4:209.132.183.28 include:_netblocks.eloqua.com include:us._netblocks.mimecast.com -all"
MTA-STS
This hostname does not publish an MTA-STS policy (no v=STSv1 TXT at _mta-sts.<name> and/or no policy at https://mta-sts.<name>/.well-known/mta-sts.txt).
Text Content
opensource.com. 1200 IN TXT "google-site-verification=X28eGinKFncUAc3Z2eE3MPs3JPzYsfmhC2HNu78IY-8"