2604:180:1:c1a::/64

IP Information
IP Type IPv6
CIDR 2604:180:1:c1a::/64
Network Bits 64
Minimum IP 2604:180:1:c1a::
Gateway 2604:180:1:c1a::1
Primary IP 2604:180:1:c1a::2
Last Usable IP 2604:180:1:c1a:ffff:ffff:ffff:fffe
Maximum IP 2604:180:1:c1a:ffff:ffff:ffff:ffff
Number of Usable IPs 18446744073709551615

IP Information
IP Type IPv6
CIDR 2604:180:1:c1a::2/128
IP 2604:180:1:c1a::2
Network Bits 128

2001:19f0:7000:8de2:5400:ff:fe1a:2ca/64 这是一个ipv6地址，/64主要是用于路由网段，路由的路径。