Tool guideDNS & Domains
Nslookup – Complete Guide to DNS Record Lookups
What a DNS lookup really asks, how to query A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and SRV records online, and how to read NXDOMAIN, empty answers and TTLs.
Tagged “ttl”
Technical guides for every NetTools.tech tool — what it does, how it works, how to read the results and how to troubleshoot — plus articles for system administrators, DevOps engineers and security professionals.
Tool guideDNS & Domains
DNS Propagation Checker – Complete Guide to DNS Caching, TTL and Record Changes
DNS changes are not pushed anywhere: resolvers serve cached answers until the TTL expires. How to compare many public resolvers, read matching and different answers, and plan record changes.
Tool guideEmail Tools
Email DNS Propagation – Complete Guide to Checking MX, SPF and DMARC Changes
Why email DNS changes take time to appear, how the NetTools.tech Email DNS Propagation checker compares one email record across eight public resolvers, and how to read mixed answers.
Tool guideNetwork Diagnostics
Ping – Complete Guide to ICMP Echo, Latency and Packet Loss
What ping measures, how ICMP echo request and reply work, how to read RTT, TTL, loss and jitter, and why a host that ignores ping is not necessarily down.
Tool guideNetwork Diagnostics
Traceroute – Complete Guide to Tracing Network Paths Hop by Hop
How traceroute discovers the routers between two hosts, what the hop table, asterisks and timings mean, and how to use an online traceroute to locate path problems.