DNS Learning Hub
Everything about DNS in one place: record glossary (A, AAAA, MX, TXT, CNAME), how-to guides (DNSSEC, propagation), DNS-related SSL errors, alternatives to popular services, fresh Runet research.
Glossary (6) all →
TLD — Top-Level Domain, .com, .ru, .io zones
TLD (Top-Level Domain) is the top-level zone. Types: gTLD, ccTLD, sTLD. Examples, pricing, 2026 registrars.
DNSSEC — What It Is and How It Works [2026]
DNSSEC — definition, examples, applications. Online check free.
CAA record — Definition and Use Cases [2026]
CAA record — explanation, syntax, applications. Online check.
SRV DNS Record — What It Is and How to Check [2026]
SRV record — clear explanation, how to configure, common mistakes. Online check free.
PTR Record (Reverse DNS) Explained [2026]
PTR record (reverse DNS) — clear explanation, how to configure, common mistakes. Online check free.
CNAME Record — What It Is, Simple Explanation [2026]
CNAME DNS record — clear explanation: what it means, how it works, how it differs from A record. Check CNAME online for free.
How-to (3) all →
How to Set Up an SPF Record — 2026 Guide
Step-by-step guide to configuring SPF. TXT records, syntax, testing, common mistakes. Boost email deliverability.
How to Check DNSSEC for a Domain — 2026 Guide
DNSSEC verification methods: online checker, dig, delv, browser extensions. How to tell if a domain is signed and the chain is valid.
How to Check DNS Records Online [2026]
Step-by-step: check A, AAAA, MX, NS, TXT, CNAME records online. Free, no limits.
Alternatives (3) all →
SecurityTrails Alternatives 2026 — DNS & Asset Discovery
SecurityTrails is a DNS + asset discovery platform. Alternatives: Enterno.io, crt.sh, DNSdumpster, VirusTotal Passive DNS.
MXToolbox Alternatives 2026 — DNS & Email Tools
MXToolbox cut its free tier in 2024. 6 alternatives for DNS/MX/blacklist checks: Enterno.io DNS, Google Dig, intoDNS, DNSChecker.
DNSChecker.org Alternatives 2026 — DNS Propagation
DNSChecker.org shows DNS propagation from 50 global locations. Alternatives: Enterno.io DNS, WhatsMyDNS, DNSWatch.
Research (4) all →
DNS Propagation in Runet 2026 — Benchmark
DNS record propagation speed across registrars. Data from 15+ global resolvers. Enterno.io Q1 2026.
DNSSEC Adoption in Runet 2026 — Why It Is Still Low
DNSSEC study of .ru/.рф/.su domains: 4.1% signed. Reasons for the gap and when growth is expected. March 2026 data.
DNS TTL Benchmark — Runet 2026
DNS TTL research across top-5k .ru: A records median 3600s, CDN 300s, legacy up to 86400s. How to pick a TTL for migration.
CAA Record Adoption 2026 — Runet Benchmark
CAA DNS record research: 14% of top-5k Russian domains use CAA. Defence against mis-issuance, CA leaders.