Find the mask, network, broadcast and host range for an IPv4 CIDR address. Check a PLC or HMI peer against that subnet.
YOUR INPUTS
LIVE RESULT
Network address
Subnet mask
255.255.255.224
Broadcast
192.168.10.63
First usable address
192.168.10.33
Last usable address
192.168.10.62
Usable addresses
30
Peer check
Peer is a usable address in this subnet.
Calculated
Peer is a usable address in this subnet.
FOLLOW THE SIGNAL01 / 09
THE RELATIONSHIP192.168.10.35 AND 255.255.255.224 = 192.168.10.32
How to use this on a job
Two addresses that look similar can still be on different subnets. The prefix decides which bits describe the network. Compare the masked addresses before changing cables or inventing a gateway.
01
Enter the interface’s IPv4 address and CIDR prefix. Use plain decimal octets without leading zeros so there is no ambiguity with other numeric notations.
02
Read the network, broadcast and usable range. For ordinary subnets, the network and broadcast addresses are not assignable host addresses.
03
Enter a peer address to test membership in this interface’s subnet. Membership is only one side of the configuration: the peer’s mask, VLAN, firewall and physical link still matter.
Work through one example
/27 → 255.255.255.224 → blocks of 32 addresses
192.168.10.35/27 belongs to network 192.168.10.32. Its broadcast is .63 and its ordinary hosts run from .33 through .62. A peer at .63 matches the network bits but is not a usable host. A peer at .64 is already in the next /27 subnet.
Before you trust the answer
Being in the same subnet does not prove reachability. An address at the broadcast boundary belongs numerically to the subnet but cannot be assigned as an ordinary host. The calculator reports these as separate facts. Use /31 only with devices and links that support that point-to-point convention.
TRYPLC FIELD REFERENCE / 01
IPv4 Subnet Calculator
Find the mask, network, broadcast and host range for an IPv4 CIDR address. Check a PLC or HMI peer against that subnet.
Network = address AND mask
Total addresses = 2^(32 − prefix)
Ordinary usable hosts = total − 2
/31: two endpoints on a point-to-point link
/32: one address, not a shared LAN
How to use this on a job
Two addresses that look similar can still be on different subnets. The prefix decides which bits describe the network. Compare the masked addresses before changing cables or inventing a gateway.
01
Enter the interface’s IPv4 address and CIDR prefix. Use plain decimal octets without leading zeros so there is no ambiguity with other numeric notations.
02
Read the network, broadcast and usable range. For ordinary subnets, the network and broadcast addresses are not assignable host addresses.
03
Enter a peer address to test membership in this interface’s subnet. Membership is only one side of the configuration: the peer’s mask, VLAN, firewall and physical link still matter.
Work through one example
/27 → 255.255.255.224 → blocks of 32 addresses
192.168.10.35/27 belongs to network 192.168.10.32. Its broadcast is .63 and its ordinary hosts run from .33 through .62. A peer at .63 matches the network bits but is not a usable host. A peer at .64 is already in the next /27 subnet.
Before you trust the answer
Being in the same subnet does not prove reachability. An address at the broadcast boundary belongs numerically to the subnet but cannot be assigned as an ordinary host. The calculator reports these as separate facts. Use /31 only with devices and links that support that point-to-point convention.