Sage-Tips

How do I find my last usable IP address?

Add one address to the subnet address to find the first usable IP address. 2. Subtract one address from the broadcast address to find the last usable IP address. The following table shows all of the new possible subnets; the usable range of IP addresses for each subnet; and the broadcast address for each subnet.

How do you find the subnet prefix length of IPv4?

In IPv4, the prefix (or network portion) of the address can be identified by a dotted-decimal netmask, commonly referred to as a subnet mask. For example, 255.255. 255.0 indicates that the network portion, or prefix length, of the IPv4 address is the leftmost 24 bits.

What is the subnetwork number of a host with an IP address of 172.16 66.0 21?

What is the subnetwork number of a host with an IP address of 172.16. 66.0/21? Explanation: A /21 is 255.255….Exercise :: Subnetting – Subnetting.

A.	172.16.112.0
B.	172.16.0.0
C.	172.16.96.0
D.	172.16.255.0

How do I subnet ipv4?

To make more subnet in Class A, bits from Host part are borrowed and the subnet mask is changed accordingly. For example, if one MSB (Most Significant Bit) is borrowed from host bits of second octet and added to Network address, it creates two Subnets (21=2) with (223-2) 8388606 Hosts per Subnet.

How many usable host addresses are available on an IPv4 subnet that is configured with a 28 mask?

Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References

CIDR	Subnet mask	# of usable IP addresses
/7	254.0.0.0	33,554,430
/6	252.0.0.0	67,108,862
/5	248.0.0.0	134,217,726
/4	240.0.0.0	268,435,454

What is subnet mask in IPv4?

IPv4 subnet masks One part identifies the network (the network number) and the other part identifies the specific machine or host within the network (the host number). Subnet masks (IPv4) and prefixes (IPv6) identify the range of IP addresses that make up a subnet, or group of IP addresses on the same network.