Net-Sec.Tools
Subnet Calculator
Subnet Slicer/VLSM Calculator
Networking Tools
BGP Tools
Single Subnet Analysis
IP Address (v4 or v6)
CIDR / Mask
/1 (128.0.0.0)
/2 (192.0.0.0)
/3 (224.0.0.0)
/4 (240.0.0.0)
/5 (248.0.0.0)
/6 (252.0.0.0)
/7 (254.0.0.0)
/8 (255.0.0.0)
/9 (255.128.0.0)
/10 (255.192.0.0)
/11 (255.224.0.0)
/12 (255.240.0.0)
/13 (255.248.0.0)
/14 (255.252.0.0)
/15 (255.254.0.0)
/16 (255.255.0.0)
/17 (255.255.128.0)
/18 (255.255.192.0)
/19 (255.255.224.0)
/20 (255.255.240.0)
/21 (255.255.248.0)
/22 (255.255.252.0)
/23 (255.255.254.0)
/24 (255.255.255.0)
/25 (255.255.255.128)
/26 (255.255.255.192)
/27 (255.255.255.224)
/28 (255.255.255.240)
/29 (255.255.255.248)
/30 (255.255.255.252)
/31 (255.255.255.254)
/32 (255.255.255.255)
/48
/56
/64
/126
/128
Analyze Network
Download Report
Calculation Results
Enter an IP (v4 or v6) on the left.
VLSM Subnet Calculator
Base Network
Base Mask
/1 (128.0.0.0)
/2 (192.0.0.0)
/3 (224.0.0.0)
/4 (240.0.0.0)
/5 (248.0.0.0)
/6 (252.0.0.0)
/7 (254.0.0.0)
/8 (255.0.0.0)
/9 (255.128.0.0)
/10 (255.192.0.0)
/11 (255.224.0.0)
/12 (255.240.0.0)
/13 (255.248.0.0)
/14 (255.252.0.0)
/15 (255.254.0.0)
/16 (255.255.0.0)
/17 (255.255.128.0)
/18 (255.255.192.0)
/19 (255.255.224.0)
/20 (255.255.240.0)
/21 (255.255.248.0)
/22 (255.255.252.0)
/23 (255.255.254.0)
/24 (255.255.255.0)
/25 (255.255.255.128)
/26 (255.255.255.192)
/27 (255.255.255.224)
/28 (255.255.255.240)
/29 (255.255.255.248)
/30 (255.255.255.252)
/31 (255.255.255.254)
/32 (255.255.255.255)
/48
/56
/64
/126
/128
Slicing Strategy
Divide into N Subnets
Divide by Hosts (v4 only)
Quantity:
4
Slice Network
Download CSV
Output...
Network Utilities
Target (Domain or IP)
DNS Dig
Reverse DNS
Whois
SSL Analysis
Traceroute
BGP/ASN
🛠️
Select a tool to run diagnostics.
BGP Tools
ASN Number
Lookup ASN
Organization Name
Lookup Org ASNs
IP or Prefix
Lookup IP
Run a BGP query.