I am converting some CIDR using python ipaddress package like:
net4 = ipaddress.ip_network(u'10.120.160.0/19')
for x in net4.hosts():
The last address will be the subnet's broadcast address, so you can't give it to a host, and the first is the network's address itself, which is also not assigned to hosts. So both sources are correct, they just tell you different things: the python routine gives you IPs suitable for hosts, while the web page gives you all IPs in the range, including network and broadcast.