IP 네트워크 서브넷 마스크

 

 

network subnet mask 

 

서브넷 마스크

127.0.0.1 / 24 에서 24의 의미

/ 24 는  255.255.255.0 와 같다

255.255.255.0  -> 2진수 1111 1111.1111 1111.1111 1111.0000 0000

앞에서부터 연속된 1의 개수 세면 24 

https://www.calculator.net/ip-subnet-calculator.html

255.255.255.255 /32

255.255.255.254 /31

255.255.255.252 /30

255.255.255.248 /29

255.255.255.240 /28

255.255.255.224 /27

255.255.255.192 /26

255.255.255.128 /25

 

255.255.255.0 /24

255.255.254.0 /23

255.255.252.0 /22

255.255.248.0 /21

255.255.240.0 /20

255.255.224.0 /19

255.255.192.0 /18

255.255.128.0 /17

 

255.255.0.0 /16

255.254.0.0 /15

255.252.0.0 /14

255.248.0.0 /13

255.240.0.0 /12

255.224.0.0 /11

255.192.0.0 /10

255.128.0.0 /9

 

255.0.0.0 /8

254.0.0.0 /7

252.0.0.0 /6

248.0.0.0 /5

240.0.0.0 /4

224.0.0.0 /3

192.0.0.0 /2

128.0.0.0 /1

0.0.0.0 /0

 

//----------------------------

    - 계산

http://jodies.de/ipcalc?host=192.168.0.1&mask1=1&mask2=

 

    - 계산 , IPv6 도 가능

https://www.calculator.net/ip-subnet-calculator.html