Web:
185.59.147.165
2a02:6c20:824:100:185:59:147:165

IMPnet
88.146.225.50

develop web
185.59.147.166
2a02:6c20:824:100:185:59:147:166

Maily:
185.179.35.15
185.179.33.22

SPF
v=spf1 a mx include:_spf.impnet.cz include:amccomp.cz -all