--- title: "#dns articles | Hashnode" description: "Explore 2,250 articles tagged #dns on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/dns" --- Tag # #dns 2,250 posts · 29 followers [Meysam Azad](https://hashnode.com/@meysam81) · [8h ago](https://hashnode.com/posts/spf-record-syntax-mechanisms-qualifiers-modifiers-and-macros/6af43b70fd9be29cc18930a2) ### [SPF Record Syntax: Mechanisms, Qualifiers, Modifiers, and Macros](https://dmarcguard.hashnode.dev/spf-record-syntax-mechanisms-qualifiers-modifiers-and-macros?utm_source=hashnode&utm_medium=feed) Short answer SPF record syntax follows one shape: a single DNS TXT record starting with v=spf1, followed by space-separated terms — mechanisms with optional qualifiers, then modifiers — evaluated left 21 min read · [dmarcguard.hashnode.dev](https://dmarcguard.hashnode.dev/spf-record-syntax-mechanisms-qualifiers-modifiers-and-macros?utm_source=hashnode&utm_medium=feed) [Swift Labs](https://hashnode.com/@swiftlabs) · [1d ago](https://hashnode.com/posts/550-5-7-1-message-rejected-message-lacks-spf-dkim-dmarc-auth-records-outlook-com-fix/6af316386ded37f1da770ed9) ### [550 5.7.1 Message rejected: Message lacks SPF/DKIM/DMARC Auth Records (Outlook.com fix)](https://swiftlabs.hashnode.dev/550-5-7-1-message-rejected-message-lacks-spf-dkim-dmarc-auth-records-outlook-com-fix?utm_source=hashnode&utm_medium=feed) Outlook.com and Hotmail are bouncing mail from domains with no DMARC record. What the 550 5.7.1 error means and the one TXT record to add. 7 min read · [swiftlabs.hashnode.dev](https://swiftlabs.hashnode.dev/550-5-7-1-message-rejected-message-lacks-spf-dkim-dmarc-auth-records-outlook-com-fix?utm_source=hashnode&utm_medium=feed) [The Network Tools](https://hashnode.com/@thenetworktools) · [3d ago](https://hashnode.com/posts/how-to-check-a-domain-s-owner-registrar-and-expiry-date-without-an-account/6af07e0666b50885a7deb887) ### [How to Check a Domain's Owner, Registrar and Expiry Date Without an Account](https://thenetworktools.hashnode.dev/how-to-check-a-domain-s-owner-registrar-and-expiry-date-without-an-account?utm_source=hashnode&utm_medium=feed) For many registered domains, public registration records can show which registrar manages the domain, when it was created, when it expires, and which nameservers serve its DNS. You don't need to insta 3 min read · [thenetworktools.hashnode.dev](https://thenetworktools.hashnode.dev/how-to-check-a-domain-s-owner-registrar-and-expiry-date-without-an-account?utm_source=hashnode&utm_medium=feed) [The Network Tools](https://hashnode.com/@thenetworktools) · [3d ago](https://hashnode.com/posts/why-your-emails-land-in-spam-3-free-checks-you-can-run-in-your-browser/6af089410148471a43cf35a3) ### [Why your emails land in spam: 3 free checks you can run in your browser](https://thenetworktools.hashnode.dev/why-your-emails-land-in-spam-3-free-checks-you-can-run-in-your-browser?utm_source=hashnode&utm_medium=feed) If people tell you your emails never arrived, the cause is not always the message itself. Domain setup is one of the first places to look: your DMARC policy, your DNS records (where SPF and DKIM live) 4 min read · [thenetworktools.hashnode.dev](https://thenetworktools.hashnode.dev/why-your-emails-land-in-spam-3-free-checks-you-can-run-in-your-browser?utm_source=hashnode&utm_medium=feed) [Andrew Molyuk](https://hashnode.com/@andrewmolyuk) · [2d ago](https://hashnode.com/posts/rdap-vs-whois-why-some-domains-hide-their-expiry/6af0e3c24c4448cd1f0ad654) ### [RDAP vs WHOIS: Why Some Domains Hide Their Expiry](https://checkmeup.hashnode.dev/rdap-vs-whois-why-some-domains-hide-their-expiry?utm_source=hashnode&utm_medium=feed) Why a .com expiry date shows up instantly but .io, .de or .co.il lookups fail: where expiry data comes from, RDAP vs WHOIS, and how to check it. 6 min read · [checkmeup.hashnode.dev](https://checkmeup.hashnode.dev/rdap-vs-whois-why-some-domains-hide-their-expiry?utm_source=hashnode&utm_medium=feed) [jbook](https://hashnode.com/@jbook) · [3d ago](https://hashnode.com/posts/the-proxy-switch-that-slowed-the-page-down/6af0284ba9e5dd2d4d1b793a) ### [The Proxy Switch That Slowed the Page Down](https://jbook.hashnode.dev/the-proxy-switch-that-slowed-the-page-down?utm_source=hashnode&utm_medium=feed) The site lived on a server in Hong Kong, and most of its readers were in mainland China. A direct connection from those readers to the server was short, and a page came back in under half a second. Cl 3 min read · [jbook.hashnode.dev](https://jbook.hashnode.dev/the-proxy-switch-that-slowed-the-page-down?utm_source=hashnode&utm_medium=feed) [HackerMe](https://hashnode.com/@hackerme) · [3d ago](https://hashnode.com/posts/the-campaign-ended-its-subdomain-is-still-pointing-somewhere/6aef8647d8d00f0280ce98d2) ### [The Campaign Ended. Its Subdomain Is Still Pointing Somewhere.](https://hackerme.hashnode.dev/the-campaign-ended-its-subdomain-is-still-pointing-somewhere?utm_source=hashnode&utm_medium=feed) How dangling DNS records turn into subdomain takeovers, and how to find and retire them in your own zone. 7 min read · [hackerme.hashnode.dev](https://hackerme.hashnode.dev/the-campaign-ended-its-subdomain-is-still-pointing-somewhere?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/the-campaign-ended-its-subdomain-is-still-pointing-somewhere/6aef8647d8d00f0280ce98d2) [Antonin Courtadon](https://hashnode.com/@antonincourtadon) · [4d ago](https://hashnode.com/posts/free-subdomain-for-your-game-server-bot-or-website-how-it-works/6aef671d7b6cb14a04e6fbe7) ### [Free Subdomain for Your Game Server, Bot or Website: How It Works](https://antonincourtadon.hashnode.dev/free-subdomain-for-your-game-server-bot-or-website-how-it-works?utm_source=hashnode&utm_medium=feed) Disclosure: I'm Antonin Courtadon, founder of ACLClouds. Nobody wants to share 203.0.113.45:25565 with friends. A name such as play.example.com is easier to remember, easier to change when the server 6 min read · [antonincourtadon.hashnode.dev](https://antonincourtadon.hashnode.dev/free-subdomain-for-your-game-server-bot-or-website-how-it-works?utm_source=hashnode&utm_medium=feed) [Lalit Kumar Jangid](https://hashnode.com/@lalitkumarjangid) · [4d ago](https://hashnode.com/posts/dmarc-adoption-top-10000-domains/6aef4d7ef375e7cfba9ad220) ### [I checked the DMARC records of the top 10,000 domains. Only 61% enforce it](https://lalitkumarjangid.hashnode.dev/dmarc-adoption-top-10000-domains?utm_source=hashnode&utm_medium=feed) A DNS scan of SPF, DMARC, BIMI and MTA-STS across the top 10,000 domains: the method in Node, the parsing traps and the results. 9 min read · [lalitkumarjangid.hashnode.dev](https://lalitkumarjangid.hashnode.dev/dmarc-adoption-top-10000-domains?utm_source=hashnode&utm_medium=feed) [Muhammad Ali Mughal](https://hashnode.com/@ali978123) · [4d ago](https://hashnode.com/posts/dnssec-explained-verify-the-chain-of-trust-yourself/6aef0db87eddc64778323929) ### [DNSSEC Explained: Verify the Chain of Trust Yourself](https://resume-ai.hashnode.dev/dnssec-explained-verify-the-chain-of-trust-yourself?utm_source=hashnode&utm_medium=feed) Check DS, DNSKEY and RRSIG records with curl, recompute a DS digest in Python, and read SERVFAIL errors to see if DNSSEC actually protects your domain. 9 min read · [resume-ai.hashnode.dev](https://resume-ai.hashnode.dev/dnssec-explained-verify-the-chain-of-trust-yourself?utm_source=hashnode&utm_medium=feed)