IPRangeExplorer

171.236.128.0/18

Public

Class B — /18 prefix — 16,382 usable hosts

Network Address
171.236.128.0
Broadcast Address
171.236.191.255
Subnet Mask
255.255.192.0
Usable Hosts
16,382
First Usable IP
171.236.128.1
Last Usable IP
171.236.191.254
Total IPs
16,384
Prefix Length
/18

Network address — the base address of the block (171.236.128.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 171.236.191.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 16,382 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.192.0 is the dotted-decimal equivalent of /18. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation 171.236.128.0/18
Network Address 171.236.128.0
Broadcast Address 171.236.191.255
Subnet Mask 255.255.192.0
Wildcard Mask 0.0.63.255
Prefix Length /18
IP Address Class Class B
Total IP Addresses 16,384
Usable Host Addresses 16,382
First Usable IP 171.236.128.1
Last Usable IP 171.236.191.254
Network (Hex) 0xABEC8000
Broadcast (Hex) 0xABECBFFF
Address Type Public / Globally Routable

Binary Representation

Network Address
10101011.11101100 10101011.11101100.10000000.00000000
Subnet Mask
11111111.11111111.11000000.00000000

The first 18 bits (1s in the mask) identify the network. The remaining 14 bits identify hosts within the network.

Split into Equal Subnets

Split 171.236.128.0/18 into 2 equal /19 subnets (8,190 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 171.236.128.0/19 171.236.128.0 171.236.128.1 171.236.159.254 171.236.159.255 8,190
2 171.236.160.0/19 171.236.160.0 171.236.160.1 171.236.191.254 171.236.191.255 8,190

/18 Subnet Reference

Total IPs 16,384
Usable Hosts 16,382
Subnet Mask 255.255.192.0
Wildcard 0.0.63.255
Full /18 reference →

Related Ranges

Parent /17 block 171.236.128.0/17 Sibling /18 block 171.236.192.0/18

Adjacent Prefix Sizes

/16 65,534 hosts /17 32,766 hosts /18 16,382 hosts /19 8,190 hosts /20 4,094 hosts

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