http://ipchalk.com/ 1.0 http://ipchalk.com/exercises/ 2026-04-03T20:33:38+02:00 weekly 0.9 http://ipchalk.com/exercise/ipv4-addresses/ 2026-04-03T20:33:38+02:00 weekly 0.5 http://ipchalk.com/exercise/ipv4-subnet-by-mask/ 2026-04-03T20:33:38+02:00 weekly 0.5 http://ipchalk.com/how-to/ipv4-subnet-by-mask/ 2026-04-03T20:33:38+02:00 weekly 0.8 http://ipchalk.com/exercise/ipv4-subnet-by-networks/ 2026-04-03T20:33:38+02:00 weekly 0.5 http://ipchalk.com/how-to/ipv4-subnet-by-networks/ 2026-04-03T20:33:38+02:00 weekly 0.8 http://ipchalk.com/exercise/ipv6-notation/ 2026-04-03T20:33:38+02:00 weekly 0.5