Network Engineering Desk
Addressing
IPv4 Subnet Workbench
Subnet, mask, wildcard, host range and address classification.
Local onlyGuide & details ↗
InputUse your own values. Example values are never pre-filled.
Example: 192.168.12.17/27
Enter an address and prefix length. The network, broadcast, range, mask and wildcard are derived automatically.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter an IPv4 address with CIDR notation.
InputUse your own values. Example values are never pre-filled.
Example: 10.20.0.0/22
The block you actually own or want to subdivide.One subnet per line
Format: Label: number of hosts.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter a parent network and host requirements.
InputUse your own values. Example values are never pre-filled.
Example: two /24s
The result shows both the candidate summary and any additional address space it covers.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetPaste two or more IPv4 prefixes.
InputUse your own values. Example values are never pre-filled.
Example: 2001:db8:10::123/64
Shows normalized form, prefix boundaries, /64 count and special-purpose classification.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter an IPv6 address and prefix.
InputUse your own values. Example values are never pre-filled.
Only the domain is queried
A full email is reduced to its domain. Contact details may be redacted by the registry.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter a domain, URL or email, then run the lookup.
InputUse your own values. Example values are never pre-filled.
Same-origin only
Windows · Linux · macOS · Cisco · Junos
ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetRun an HTTP latency test or paste real ping output.
InputUse your own values. Example values are never pre-filled.
IP or hostname
Command syntax
IPv4 or IPv6
ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter a target to generate a command, or paste trace output for analysis.
InputUse your own values. Example values are never pre-filled.
Ethernet default: 1500
Approximate overhead preset
MSS header model
ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetChoose the underlay MTU and encapsulation assumptions.
InputUse your own values. Example values are never pre-filled.
Required
Decimal units
Required
bits/s
Optional
For BDP
ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetEnter transfer size and link rate.
InputUse your own values. Example values are never pre-filled.
Examples: 443, BGP, VXLAN
Search by port number, transport, service name or category.ResultUpdates locally unless the tool explicitly performs a lookup.
No result yetType a port number or service name.