Calculated Network Details
RFC 1918 Private
Network Address
192.168.1.0 /24
Broadcast Address
192.168.1.255
Usable Host Range
192.168.1.1 - 192.168.1.254
Usable Hosts
254
Total Subnet IPs
256
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
IPv4 Class
Class C
Binary Subnet Mask
11111111.11111111.11111111.00000000
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Understanding CIDR & IPv4 Subnetting
Classless Inter-Domain Routing (CIDR) was introduced in 1993 (RFC 1519) to slow the growth of routing tables on the global Internet and delay the exhaustion of IPv4 addresses. Instead of allocating rigid Class A, B, or C blocks, CIDR allows variable-length subnet masking (VLSM).
Common Subnet Masks Reference Table
| CIDR | Subnet Mask | Total IPs | Usable Hosts | Typical Use Case |
|---|---|---|---|---|
/32 |
255.255.255.255 | 1 | 1 | Single host route / loopback interface |
/30 |
255.255.255.252 | 4 | 2 | Point-to-point router links |
/28 |
255.255.255.240 | 16 | 14 | Small office LAN / isolated DMZ |
/24 |
255.255.255.0 | 256 | 254 | Standard LAN subnet / cloud VPC tier |
/20 |
255.255.240.0 | 4,096 | 4,094 | Enterprise multi-department networks |
/16 |
255.255.0.0 | 65,536 | 65,534 | Corporate backbone / AWS VPC block |
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RFC 1918 Private IP Ranges
The Internet Assigned Numbers Authority (IANA) reserved three blocks of IPv4 space for private networks:
- 10.0.0.0 – 10.255.255.255 (10.0.0.0/8 prefix, 16,777,216 addresses)
- 172.16.0.0 – 172.31.255.255 (172.16.0.0/12 prefix, 1,048,576 addresses)
- 192.168.0.0 – 192.168.255.255 (192.168.0.0/16 prefix, 65,536 addresses)
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