10.244.0.0/16

Private (RFC 1918) RFC 1918

The 10.244.0.0/16 range is the default pod CIDR used by Flannel, one of the most popular Kubernetes CNI plugins. Each node gets a /24 slice of this range (e.g. 10.244.0.0/24, 10.244.1.0/24) from which pod IPs are assigned.

Network Address

10.244.0.0

Broadcast Address

10.244.255.255

Subnet Mask

255.255.0.0

Usable Hosts

65,534

First Usable IP

10.244.0.1

Last Usable IP

10.244.255.254

Total IPs

65,536

Prefix Length

/16

Network address — the base address of the block (10.244.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 10.244.255.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 65,534 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.0.0 is the dotted-decimal equivalent of /16. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	10.244.0.0/16
Network Address	10.244.0.0
Broadcast Address	10.244.255.255
Subnet Mask	255.255.0.0
Wildcard Mask	0.0.255.255
Prefix Length	/16
IP Address Class	Class A
Total IP Addresses	65,536
Usable Host Addresses	65,534
First Usable IP	10.244.0.1
Last Usable IP	10.244.255.254
Network (Hex)	0x0AF40000
Broadcast (Hex)	0x0AF4FFFF
Governing RFC	RFC 1918
Address Type	Private (RFC 1918)

Binary Representation

Network Address

00001010.11110100 00001010.11110100.00000000.00000000

Subnet Mask

11111111.11111111.00000000.00000000

The first 16 bits (1s in the mask) identify the network. The remaining 16 bits identify hosts within the network.

Split into Equal Subnets

Split 10.244.0.0/16 into 2 equal /17 subnets (32,766 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.244.0.0/17	10.244.0.0	10.244.0.1	10.244.127.254	10.244.127.255	32,766
2	10.244.128.0/17	10.244.128.0	10.244.128.1	10.244.255.254	10.244.255.255	32,766

Split 10.244.0.0/16 into 4 equal /18 subnets (16,382 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.244.0.0/18	10.244.0.0	10.244.0.1	10.244.63.254	10.244.63.255	16,382
2	10.244.64.0/18	10.244.64.0	10.244.64.1	10.244.127.254	10.244.127.255	16,382
3	10.244.128.0/18	10.244.128.0	10.244.128.1	10.244.191.254	10.244.191.255	16,382
4	10.244.192.0/18	10.244.192.0	10.244.192.1	10.244.255.254	10.244.255.255	16,382

Split 10.244.0.0/16 into 8 equal /19 subnets (8,190 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.244.0.0/19	10.244.0.0	10.244.0.1	10.244.31.254	10.244.31.255	8,190
2	10.244.32.0/19	10.244.32.0	10.244.32.1	10.244.63.254	10.244.63.255	8,190
3	10.244.64.0/19	10.244.64.0	10.244.64.1	10.244.95.254	10.244.95.255	8,190
4	10.244.96.0/19	10.244.96.0	10.244.96.1	10.244.127.254	10.244.127.255	8,190
5	10.244.128.0/19	10.244.128.0	10.244.128.1	10.244.159.254	10.244.159.255	8,190
6	10.244.160.0/19	10.244.160.0	10.244.160.1	10.244.191.254	10.244.191.255	8,190
7	10.244.192.0/19	10.244.192.0	10.244.192.1	10.244.223.254	10.244.223.255	8,190
8	10.244.224.0/19	10.244.224.0	10.244.224.1	10.244.255.254	10.244.255.255	8,190

Split 10.244.0.0/16 into 16 equal /20 subnets (4,094 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.244.0.0/20	10.244.0.0	10.244.0.1	10.244.15.254	10.244.15.255	4,094
2	10.244.16.0/20	10.244.16.0	10.244.16.1	10.244.31.254	10.244.31.255	4,094
3	10.244.32.0/20	10.244.32.0	10.244.32.1	10.244.47.254	10.244.47.255	4,094
4	10.244.48.0/20	10.244.48.0	10.244.48.1	10.244.63.254	10.244.63.255	4,094
5	10.244.64.0/20	10.244.64.0	10.244.64.1	10.244.79.254	10.244.79.255	4,094
6	10.244.80.0/20	10.244.80.0	10.244.80.1	10.244.95.254	10.244.95.255	4,094
7	10.244.96.0/20	10.244.96.0	10.244.96.1	10.244.111.254	10.244.111.255	4,094
8	10.244.112.0/20	10.244.112.0	10.244.112.1	10.244.127.254	10.244.127.255	4,094
9	10.244.128.0/20	10.244.128.0	10.244.128.1	10.244.143.254	10.244.143.255	4,094
10	10.244.144.0/20	10.244.144.0	10.244.144.1	10.244.159.254	10.244.159.255	4,094
11	10.244.160.0/20	10.244.160.0	10.244.160.1	10.244.175.254	10.244.175.255	4,094
12	10.244.176.0/20	10.244.176.0	10.244.176.1	10.244.191.254	10.244.191.255	4,094
13	10.244.192.0/20	10.244.192.0	10.244.192.1	10.244.207.254	10.244.207.255	4,094
14	10.244.208.0/20	10.244.208.0	10.244.208.1	10.244.223.254	10.244.223.255	4,094
15	10.244.224.0/20	10.244.224.0	10.244.224.1	10.244.239.254	10.244.239.255	4,094
16	10.244.240.0/20	10.244.240.0	10.244.240.1	10.244.255.254	10.244.255.255	4,094