203.0.113.0/24 (Documentation (TEST-NET-3))
Not routableRFC 5737
203.0.113.0/24 at a glance
| CIDR block | 203.0.113.0/24 |
|---|---|
| First address | 203.0.113.0 |
| Last address | 203.0.113.255 |
| Total addresses | 256 |
| Subnet mask | 255.255.255.0 |
| Prefix length | /24 |
| Type | Not routable |
| Publicly routable | No |
| Defined in | RFC 5737 |
Open in CIDR calculator/24 subnet details
What is 203.0.113.0/24 used for?
203.0.113.0/24 (TEST-NET-3) is the third documentation block from RFC 5737. It is often used in examples to stand for a public internet address, since it will never belong to a real network.
FAQ
What is 203.0.113.0/24 used for?
Documentation and examples (TEST-NET-3, RFC 5737). It is typically used to represent a public IP address in tutorials and sample firewall or NAT configs.
Should my firewall block 203.0.113.0/24?
Yes. Like other bogon ranges, traffic to or from it on the internet is never legitimate and is usually filtered at the edge.