See your network the way the internet sees it.
Ping, DNS, HTTP, SSL, WHOIS, ports, and more — checked from outside your network, so you see what's actually reachable, not just what your local network happens to see.
Find the right tool, fast
Every checker on netsh.io, grouped into network, DNS, security, and IP — so you're never digging through one long menu.
DNS & Mail
Engineered from the outside in
Neutral Edge Infrastructure
Every check runs from our servers, not your browser, so you see what the rest of the internet sees. Local tests only see your own Wi-Fi and corporate network.
Raw Protocol Depth
Direct wire-level checks across ICMP echo packets, TCP handshakes, TLS 1.3 certificates, and recursive DNS — free from local browser spoofing or cached routes.
Zero-Log Privacy
Every check runs in volatile memory and is instantly discarded. We never log search history, store queried hostnames, or track visitors.
Script your network health in seconds
23 diagnostics on netsh.io are backed by high-performance JSON endpoints. Automate SSL certificate alerts, CI/CD deployment gates, and DNS verification with a clean, stable v1 API contract.
curl "https://netsh.io/api/v1/ping?host=1.1.1.1" \
-H "x-api-key: YOUR_KEY"{
"ok": true,
"data": {
"host": "1.1.1.1",
"status": "Online",
"sent": 4,
"received": 4,
"lossPercent": 0,
"average": 5
},
"meta": { "tool": "ping", "version": "v1" }
}Network protocols, explained
Practical guides on DNS, email deliverability, SSL/TLS, and network diagnostics.
Why DNS Propagation Takes Time (and How to Track It)
What actually happens between updating a DNS record and the whole internet seeing it, and why 24-48 hours is a real, not arbitrary, number.
DMARC Explained: none, quarantine, and reject
How DMARC's policy tag actually controls what happens to spoofed mail, why most domains start at "none," and how it depends on SPF and DKIM to mean anything at all.
What an SSL Certificate Actually Tells You
How to read a TLS certificate's expiry, issuer, and covered domains, and why certificate errors happen even when a site is otherwise healthy.