https://captf.com/practice-ctf/
https://unaalmes.hispasec.com/login
https://365.csaw.io/
https://defcon2018.ctfd.io/
https://ctf.hackucf.org/challenges
http://ctf.infosecinstitute.com/index.php
https://junior.stillhackinganyway.nl/home…
https://challenges.re
https://angstromctf.com
https://3206.innotecsystem.com/home
https://hack.me
http://www.cipher-ctf.org/CaptureTheFlag.php
https://www.cybergamesuk.com/code-crackers
https://atenea.ccn-cert.cni.es/home
https://www.hackthebox.eu/
http://ctfs.me/
https://ctf365.com/
https://overthewire.org/wargames
https://www.hacking-lab.com/
https://www.picoctf.com
https://ctftime.org/
https://www.pentestit.ru/
https://shellterlabs.com/en/
https://ringzer0team.com/
https://challenges.ka0labs.org
https://www.sans.org/netwars/continuous/
https://www.sans.org/netwars/cybercity
https://www.vulnhub.com/
https://exploit-exercises.com
https://w3challs.com/
http://smashthestack.org/wargames.html
https://www.hackthissite.org/
https://www.pentesterlab.com/exercises/
https://www.root-me.org/
https://www.enigmagroup.org/
https://www.hackthis.co.uk/levels/
http://www.kioptrix.com/blog/test-page/un
http://bright-shadows.net/
https://microcorruption.com/login
http://www.dvwa.co.uk/
https://www.owasp.org/index.…/Category:OWASP_WebGoat_Project
https://sourceforge.net/projects/metasploitable/
https://bitcoinchallenge.codes
https://backdoor.sdslabs.co
http://io.netgarage.org
https://ctf.hitcon.org
http://hackthis.co.uk. https://ctf.secadmin.es
https://uni.hctf.fun/pages/home
https://ctf-classic.ihacklabs.com/
http://ctf.hackmadrid.org/home
https://ctf.honeycon.eu