IPRangeExplorer

231.9.0.0/17

Multicast RFC 5771

Class D (Multicast) — /17 prefix — 32,766 usable hosts

Network Address
231.9.0.0
Broadcast Address
231.9.127.255
Subnet Mask
255.255.128.0
Usable Hosts
32,766
First Usable IP
231.9.0.1
Last Usable IP
231.9.127.254
Total IPs
32,768
Prefix Length
/17

Network address — the base address of the block (231.9.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 231.9.127.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 32,766 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.128.0 is the dotted-decimal equivalent of /17. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation 231.9.0.0/17
Network Address 231.9.0.0
Broadcast Address 231.9.127.255
Subnet Mask 255.255.128.0
Wildcard Mask 0.0.127.255
Prefix Length /17
IP Address Class Class D (Multicast)
Total IP Addresses 32,768
Usable Host Addresses 32,766
First Usable IP 231.9.0.1
Last Usable IP 231.9.127.254
Network (Hex) 0xE7090000
Broadcast (Hex) 0xE7097FFF
Governing RFC RFC 5771
Address Type Multicast

Binary Representation

Network Address
11100111.00001001 11100111.00001001.00000000.00000000
Subnet Mask
11111111.11111111.10000000.00000000

The first 17 bits (1s in the mask) identify the network. The remaining 15 bits identify hosts within the network.

Split into Equal Subnets

Split 231.9.0.0/17 into 2 equal /18 subnets (16,382 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 231.9.0.0/18 231.9.0.0 231.9.0.1 231.9.63.254 231.9.63.255 16,382
2 231.9.64.0/18 231.9.64.0 231.9.64.1 231.9.127.254 231.9.127.255 16,382

/17 Subnet Reference

Total IPs 32,768
Usable Hosts 32,766
Subnet Mask 255.255.128.0
Wildcard 0.0.127.255
Full /17 reference →

Related Ranges

Parent /16 block 231.9.0.0/16 Sibling /17 block 231.9.128.0/17

Adjacent Prefix Sizes

/15 131,070 hosts /16 65,534 hosts /17 32,766 hosts /18 16,382 hosts /19 8,190 hosts

Calculate Another