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#dns

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SPF Record Syntax: Mechanisms, Qualifiers, Modifiers, and Macros

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 readdmarcguard.hashnode.dev

Swift Labs1d ago

550 5.7.1 Message rejected: Message lacks SPF/DKIM/DMARC Auth Records (Outlook.com fix)

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 readswiftlabs.hashnode.dev

The Network Tools3d ago

How to Check a Domain's Owner, Registrar and Expiry Date Without an Account

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 readthenetworktools.hashnode.dev

The Network Tools3d ago

Why your emails land in spam: 3 free checks you can run in your browser

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 readthenetworktools.hashnode.dev

Andrew Molyuk2d ago

RDAP vs WHOIS: Why Some Domains Hide Their Expiry

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 readcheckmeup.hashnode.dev

jbook3d ago

The Proxy Switch That Slowed the Page Down

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 readjbook.hashnode.dev

HackerMe3d ago

The Campaign Ended. Its Subdomain Is Still Pointing Somewhere.

How dangling DNS records turn into subdomain takeovers, and how to find and retire them in your own zone.

7 min readhackerme.hashnode.dev

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Antonin Courtadon4d ago

Free Subdomain for Your Game Server, Bot or Website: How It Works

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 readantonincourtadon.hashnode.dev

Lalit Kumar Jangid4d ago

I checked the DMARC records of the top 10,000 domains. Only 61% enforce it

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 readlalitkumarjangid.hashnode.dev

Muhammad Ali Mughal4d ago

DNSSEC Explained: Verify the Chain of Trust Yourself

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 readresume-ai.hashnode.dev

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