TERRAN COMMAND

NetCalc

IP Address & Subnet Calculator

⊕
IP / Netmask Calculator Core
⁄
Mask → CIDR
~
Bitwise Complement
⊞
Class C Subnet Calculator
⤴
Hosts Needed → Mask
⤵
CIDR → Host Count
→
IP → Binary / Hex
←
Hex → IP / Binary
#
Number Base Converters

Decimal → Bin / Hex

Binary → Dec / Hex

Hex → Dec / Binary

Reference Tables
⊟
Common Subnets & Masks
CIDRTotal HostsUsable NetmaskHex MaskNotes
/30 4 2 255.255.255.252 fffffffc ¹⁄₆₄ Class C
/29 8 6 255.255.255.248 fffffff8 ¹⁄₃₂ Class C
/28 16 14 255.255.255.240 fffffff0 ¹⁄₁₆ Class C
/27 32 30 255.255.255.224 ffffffe0 ¹⁄₈ Class C
/26 64 62 255.255.255.192 ffffffc0 ¼ Class C
/25 128 126 255.255.255.128 ffffff80 ½ Class C
/24 256 254 255.255.255.0 ffffff00 1 Class C
/23 512 510 255.255.254.0 fffffe00 2 Class C
/22 1,024 1,022 255.255.252.0 fffffc00 4 Class C
/21 2,048 2,046 255.255.248.0 fffff800 8 Class C
/20 4,096 4,094 255.255.240.0 fffff000 16 Class C
/19 8,192 8,190 255.255.224.0 ffffe000 32 Class C
/18 16,384 16,382 255.255.192.0 ffffc000 64 Class C
/17 32,768 32,766 255.255.128.0 ffff8000 128 Class C
/16 65,536 65,534 255.255.0.0 ffff0000 Class B
⊛
Special & Multicast Ranges

Private Ranges (RFC 1918)

10.0.0.0/8Class A — 16M hosts
172.16.0.0/12Class B — 1M hosts
192.168.0.0/16Class C — 65K hosts

Multicast (RFC 5771)

224.0.0.0/24Well-known, control
224.0.1.0–238.xInternet-wide
239.0.0.0/8Local scope

Special Addresses

127.0.0.0/8Loopback
169.254.0.0/16Link-local (APIPA)
0.0.0.0Default route
255.255.255.255Limited broadcast

Other Notable

100.64.0.0/10Shared addr (CGN)
192.0.2.0/24Documentation (TEST-NET-1)
198.51.100.0/24Documentation (TEST-NET-2)
240.0.0.0/4Reserved (future use)