Network Diagnostic

My Favorite Network Testing and Diagnostic Tools:

Online Tools URL Description
IPv4 Subnet Calculator https://jodies.de/ipcalc IPv4 address and netmask and calculator
IPv6 Subnet Calculator http://www.gestioip.net/cgi-bin/subnet_calculator.cgi Powerful free online IPv4/IPv6 subnet calculator, hierarchical addressing planner and IP address converter
Test IPv6 https://test-ipv6.com Test your browser and connection for IPv6 readiness
BGP Route Servers https://www.routeservers.org Most updated BGP Route Servers List in Internet
HE BGP Toolkit https://bgp.he.net Hurricane Electric BGP Toolkit
HE Looking Glass https://lg.he.net Hurricane Electric’s Network Looking Glass.
Urih https://urih.com Free online network tools & utilities (smart whois,hash & CRC,benchmarker,reverse IP,subnet calc, etc)
Tcpdump 101 https://tcpdump101.com Build packet capture syntax for a variety of network devices
MXToolBox https://mxtoolbox.com Free Blacklist, DNS and Email tools
Central Ops https://centralops.net/co/ Free online network tools (ping, traceroute,nslookup) based on Dallas,Texas.,USA. Can use for free for 50 times per day
IP Geo Location https://ipgeolocation.io Free IP Geolocation API and Accurate IP Lookup Database (including latitude & longitude)
DSL Reports https://www.dslreports.com/tools Speed tests, ping tests and bandwidth tools
PeeringDB https://www.peeringdb.com Freely available, user-maintained, database of networks, and the go-to location for interconnection data.
Down Detector https://downdetector.com Real-time problem & outage monitoring
WebPage Test https://www.webpagetest.org Web page Performance Testing Tool