Tom.be

Subnet
Calculator
Merger
Name

Subnet details 81.87.16.0/21

Network address 81.87.16.0
Prefix length 21 (255.255.248.0)
Range 81.87.16.0 - 81.87.23.255
Hexadecimal 51571000
Binary 01010001 01010111 00010000 00000000
Binary subnet mask 11111111 11111111 11111000 00000000
Number of hosts 2,048
Parent subnet 81.87.16.0/20🔍
Previous subnet 81.87.8.0/21🔍
Next subnet 81.87.24.0/21🔍

Subnet tree

Netblock 81.0.0.0/8🔍 RIPE-CIDR-BLOCK (AU)
Route 81.87.0.0/16🔍 AS786 JANET Jisc Services Limited (GB)🔍
Netblock 81.87.0.0/16🔍 UK-JANET-20020617 (GB)