Network Tools

Network problems rarely announce themselves. A campaign lands in spam, a site loads slowly for visitors abroad, a domain change breaks mail — and the actual cause is invisible unless you have the right probes. This category gives you five of them, each answering one concrete question.

IP reputation (IP Purity) checks whether an IP address is flagged by blacklists — the first thing to rule out when emails go to spam or a service blocks your requests. DNS Lookup shows the records the world sees for a domain, which is how you confirm a migration actually propagated or debug why mail is not arriving. WHOIS Lookup reveals who owns a domain and when it expires — useful before answering that "urgent" renewal email that may be a scam. Website Speed Test measures real load behavior so you can compare before and after adding a CDN or changing hosts. Domain Checker searches availability across dozens of TLDs at once when you are naming a new project.

How to choose: if mail is the problem, start with IP reputation, then DNS records. If a site feels slow, run the speed test twice — once with cache, once without — and compare. If you are buying a domain, check availability first, then WHOIS the incumbent if it is taken but looks dormant.

Tips from practice: run the speed test from a clean browser profile, because extensions skew results. When changing nameservers, check DNS from several locations over a few hours — propagation is not instant. And before any cold-email campaign, verify your sending IP is clean; a flagged IP poisons every message it carries.

All five tools run checks on demand and show raw results — no account, no history kept, no interpretation hidden behind a paywall.