Class A IP Address Range
Class A covers all IPv4 addresses from 1.0.0.0 to 127.255.255.255, which means every address whose first number is between 1 and 127. Very large networks. The private 10.x.x.x part is widely used by companies, VPNs and some ISP routers.
Class A at a glance
| Address range | 1.0.0.0 – 127.255.255.255 |
|---|---|
| First number | 1 – 127 |
| First bits | 0 |
| Default subnet mask | 255.0.0.0 (/8) |
| Number of networks | 126 |
| Hosts per network | 16,777,214 |
| Private range | 10.0.0.0 – 10.255.255.255 (10.0.0.0/8) |
| Used for | Very large networks. The private 10.x.x.x part is widely used by companies, VPNs and some ISP routers. |
Private IP range in Class A
The private part of Class A is 10.0.0.0 – 10.255.255.255 (10.0.0.0/8), with 16,777,216 addresses. These addresses are used inside local networks and are not routed on the internet.
Common router IPs in Class A
Router and modem makers often use these addresses as the default gateway. Open one to see the login steps:
Browse 10.0.x.x by range
Each range below lists 1,024 addresses with a link to its login page.
Special addresses in Class A
0.0.0.0/8– “This network”. 0.0.0.0 means “any address” or “no address yet”.127.0.0.0/8– Loopback. 127.0.0.1 (localhost) always points to your own device.100.64.0.0/10– Shared address space used by ISPs for carrier-grade NAT.