CIDR /5 Subnet Reference

A massive IPv4 subnet with 134.217.728 total addresses and 134.217.726 usable host addresses.

Subnet Mask248.0.0.0
Wildcard Mask7.255.255.255
Total IPs134.217.728
Usable Hosts134.217.726
Mask (Hex)F8000000
Host Bits27

Binary Breakdown

Subnet Mask11111000.00000000.00000000.00000000
Wildcard Mask00000111.11111111.11111111.11111111

Network bits (1s): 5 ·  Host bits (0s): 27

Common Uses for /5

  • Large network segment
  • ISP/enterprise allocation

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Frequently Asked Questions

What is the subnet mask for /5?

The subnet mask for /5 is 248.0.0.0 (hex: F8000000). In binary: 11111000.00000000.00000000.00000000.

How many hosts does a /5 subnet support?

A /5 subnet has 134.217.728 total addresses. Subtract 2 (network + broadcast) = 134.217.726 usable host addresses.

What is the wildcard mask for /5?

The wildcard mask (inverse mask) for /5 is 7.255.255.255. Used in Cisco ACLs and OSPF configurations to match the host portion of an address.

What is CIDR /5 used for?

Large network segment. ISP/enterprise allocation.

Complete CIDR Reference Table /0–/32

PrefixSubnet MaskWildcardTotal IPsUsable Hosts
/00.0.0.0255.255.255.2554.294.967.2964.294.967.294
/1128.0.0.0127.255.255.2552.147.483.6482.147.483.646
/2192.0.0.063.255.255.2551.073.741.8241.073.741.822
/3224.0.0.031.255.255.255536.870.912536.870.910
/4240.0.0.015.255.255.255268.435.456268.435.454
/5248.0.0.07.255.255.255134.217.728134.217.726
/6252.0.0.03.255.255.25567.108.86467.108.862
/7254.0.0.01.255.255.25533.554.43233.554.430
/8255.0.0.00.255.255.25516.777.21616.777.214
/9255.128.0.00.127.255.2558.388.6088.388.606
/10255.192.0.00.63.255.2554.194.3044.194.302
/11255.224.0.00.31.255.2552.097.1522.097.150
/12255.240.0.00.15.255.2551.048.5761.048.574
/13255.248.0.00.7.255.255524.288524.286
/14255.252.0.00.3.255.255262.144262.142
/15255.254.0.00.1.255.255131.072131.070
/16255.255.0.00.0.255.25565.53665.534
/17255.255.128.00.0.127.25532.76832.766
/18255.255.192.00.0.63.25516.38416.382
/19255.255.224.00.0.31.2558.1928.190
/20255.255.240.00.0.15.2554.0964.094
/21255.255.248.00.0.7.2552.0482.046
/22255.255.252.00.0.3.2551.0241.022
/23255.255.254.00.0.1.255512510
/24255.255.255.00.0.0.255256254
/25255.255.255.1280.0.0.127128126
/26255.255.255.1920.0.0.636462
/27255.255.255.2240.0.0.313230
/28255.255.255.2400.0.0.151614
/29255.255.255.2480.0.0.786
/30255.255.255.2520.0.0.342
/31255.255.255.2540.0.0.122
/32255.255.255.2550.0.0.011