Every IPv4Scanner guide tagged dns. All posts »
2026-09-26 · IPV4 Scanner · 5 min read
What each common DNS record type does, when to use a CNAME versus an A record, and the mistakes that quietly break a domain.
2026-09-23 · IPV4 Scanner · 4 min read
The real reasons legitimate email lands in spam, from authentication to reputation to blacklists, and a practical order to fix them in.
2026-09-22 · IPV4 Scanner · 5 min read
What SPF, DKIM and DMARC actually do, how the three fit together to stop spoofing, and the order to set them up without breaking your own mail.
2026-09-18 · IPV4 Scanner · 4 min read
How to read a WHOIS record, which dates and statuses actually matter, and why most contact details are now redacted.
2026-09-14 · IPV4 Scanner · 6 min read
Why DNS changes don't appear instantly, what TTL actually controls, and how to check propagation from around the world without waiting 48 hours.