Tom.be

Subnet
Calculator
Merger
Name

Subnet details 81.157.16.0/21

Network address 81.157.16.0
Prefix length 21 (255.255.248.0)
Range 81.157.16.0 - 81.157.23.255
Hexadecimal 519d1000
Binary 01010001 10011101 00010000 00000000
Binary subnet mask 11111111 11111111 11111000 00000000
Number of hosts 2,048
Parent subnet 81.157.16.0/20🔍
Previous subnet 81.157.8.0/21🔍
Next subnet 81.157.24.0/21🔍

Subnet tree

Netblock 81.0.0.0/8🔍 RIPE-CIDR-BLOCK (AU)
Route 81.128.0.0/11🔍 AS2856 BT-UK-AS BTnet UK Regional network (GB)🔍
Netblock 81.128.0.0/11🔍 UK-BT-20020725 (GB)
Netblock 81.144.0.0/12🔍 BT-INFRA (GB)
Netblock 81.152.0.0/13🔍 BT-CENTRAL-PLUS (GB)