Yep Zen is great! That's where I got my /29 from. They also fix issues very quickly - when netalyzr complained that my ISP couldn't handle fragmented udp packet

Yep Zen is great! That's where I got my /29 from. They also fix issues very quickly - when netalyzr complained that my ISP couldn't handle fragmented udp packets, I let them know and they fixed it within a few days.