IP Subnet Calculator

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.

IPv4 Subnet Calculator

Result

IP Address:	18.16.1.152
Network Address:	18.16.1.152
Usable Host IP Range:	NA
Broadcast Address:	18.16.1.153
Total Number of Hosts:	2
Number of Usable Hosts:	0
Subnet Mask:	255.255.255.254
Wildcard Mask:	0.0.0.1
Binary Subnet Mask:	11111111.11111111.11111111.11111110
IP Class:	C
CIDR Notation:	/31
IP Type:	Public
Short:	18.16.1.152 /31
Binary ID:	00010010000100000000000110011000
Integer ID:	303038872
Hex ID:	0x12100198
in-addr.arpa:	152.1.16.18.in-addr.arpa
IPv4 Mapped Address:	::ffff:1210.0198
6to4 Prefix:	2002:1210.0198::/48

All 128 of the Possible /31 Networks for 18.16.1.*

Network Address	Usable Host Range	Broadcast Address:
18.16.1.0	18.16.1.1 - 18.16.1.0	18.16.1.1
18.16.1.2	18.16.1.3 - 18.16.1.2	18.16.1.3
18.16.1.4	18.16.1.5 - 18.16.1.4	18.16.1.5
18.16.1.6	18.16.1.7 - 18.16.1.6	18.16.1.7
18.16.1.8	18.16.1.9 - 18.16.1.8	18.16.1.9
18.16.1.10	18.16.1.11 - 18.16.1.10	18.16.1.11
18.16.1.12	18.16.1.13 - 18.16.1.12	18.16.1.13
18.16.1.14	18.16.1.15 - 18.16.1.14	18.16.1.15
18.16.1.16	18.16.1.17 - 18.16.1.16	18.16.1.17
18.16.1.18	18.16.1.19 - 18.16.1.18	18.16.1.19
18.16.1.20	18.16.1.21 - 18.16.1.20	18.16.1.21
18.16.1.22	18.16.1.23 - 18.16.1.22	18.16.1.23
18.16.1.24	18.16.1.25 - 18.16.1.24	18.16.1.25
18.16.1.26	18.16.1.27 - 18.16.1.26	18.16.1.27
18.16.1.28	18.16.1.29 - 18.16.1.28	18.16.1.29
18.16.1.30	18.16.1.31 - 18.16.1.30	18.16.1.31
18.16.1.32	18.16.1.33 - 18.16.1.32	18.16.1.33
18.16.1.34	18.16.1.35 - 18.16.1.34	18.16.1.35
18.16.1.36	18.16.1.37 - 18.16.1.36	18.16.1.37
18.16.1.38	18.16.1.39 - 18.16.1.38	18.16.1.39
18.16.1.40	18.16.1.41 - 18.16.1.40	18.16.1.41
18.16.1.42	18.16.1.43 - 18.16.1.42	18.16.1.43
18.16.1.44	18.16.1.45 - 18.16.1.44	18.16.1.45
18.16.1.46	18.16.1.47 - 18.16.1.46	18.16.1.47
18.16.1.48	18.16.1.49 - 18.16.1.48	18.16.1.49
18.16.1.50	18.16.1.51 - 18.16.1.50	18.16.1.51
18.16.1.52	18.16.1.53 - 18.16.1.52	18.16.1.53
18.16.1.54	18.16.1.55 - 18.16.1.54	18.16.1.55
18.16.1.56	18.16.1.57 - 18.16.1.56	18.16.1.57
18.16.1.58	18.16.1.59 - 18.16.1.58	18.16.1.59
18.16.1.60	18.16.1.61 - 18.16.1.60	18.16.1.61
18.16.1.62	18.16.1.63 - 18.16.1.62	18.16.1.63
18.16.1.64	18.16.1.65 - 18.16.1.64	18.16.1.65
18.16.1.66	18.16.1.67 - 18.16.1.66	18.16.1.67
18.16.1.68	18.16.1.69 - 18.16.1.68	18.16.1.69
18.16.1.70	18.16.1.71 - 18.16.1.70	18.16.1.71
18.16.1.72	18.16.1.73 - 18.16.1.72	18.16.1.73
18.16.1.74	18.16.1.75 - 18.16.1.74	18.16.1.75
18.16.1.76	18.16.1.77 - 18.16.1.76	18.16.1.77
18.16.1.78	18.16.1.79 - 18.16.1.78	18.16.1.79
18.16.1.80	18.16.1.81 - 18.16.1.80	18.16.1.81
18.16.1.82	18.16.1.83 - 18.16.1.82	18.16.1.83
18.16.1.84	18.16.1.85 - 18.16.1.84	18.16.1.85
18.16.1.86	18.16.1.87 - 18.16.1.86	18.16.1.87
18.16.1.88	18.16.1.89 - 18.16.1.88	18.16.1.89
18.16.1.90	18.16.1.91 - 18.16.1.90	18.16.1.91
18.16.1.92	18.16.1.93 - 18.16.1.92	18.16.1.93
18.16.1.94	18.16.1.95 - 18.16.1.94	18.16.1.95
18.16.1.96	18.16.1.97 - 18.16.1.96	18.16.1.97
18.16.1.98	18.16.1.99 - 18.16.1.98	18.16.1.99
18.16.1.100	18.16.1.101 - 18.16.1.100	18.16.1.101
18.16.1.102	18.16.1.103 - 18.16.1.102	18.16.1.103
18.16.1.104	18.16.1.105 - 18.16.1.104	18.16.1.105
18.16.1.106	18.16.1.107 - 18.16.1.106	18.16.1.107
18.16.1.108	18.16.1.109 - 18.16.1.108	18.16.1.109
18.16.1.110	18.16.1.111 - 18.16.1.110	18.16.1.111
18.16.1.112	18.16.1.113 - 18.16.1.112	18.16.1.113
18.16.1.114	18.16.1.115 - 18.16.1.114	18.16.1.115
18.16.1.116	18.16.1.117 - 18.16.1.116	18.16.1.117
18.16.1.118	18.16.1.119 - 18.16.1.118	18.16.1.119
18.16.1.120	18.16.1.121 - 18.16.1.120	18.16.1.121
18.16.1.122	18.16.1.123 - 18.16.1.122	18.16.1.123
18.16.1.124	18.16.1.125 - 18.16.1.124	18.16.1.125
18.16.1.126	18.16.1.127 - 18.16.1.126	18.16.1.127
18.16.1.128	18.16.1.129 - 18.16.1.128	18.16.1.129
18.16.1.130	18.16.1.131 - 18.16.1.130	18.16.1.131
18.16.1.132	18.16.1.133 - 18.16.1.132	18.16.1.133
18.16.1.134	18.16.1.135 - 18.16.1.134	18.16.1.135
18.16.1.136	18.16.1.137 - 18.16.1.136	18.16.1.137
18.16.1.138	18.16.1.139 - 18.16.1.138	18.16.1.139
18.16.1.140	18.16.1.141 - 18.16.1.140	18.16.1.141
18.16.1.142	18.16.1.143 - 18.16.1.142	18.16.1.143
18.16.1.144	18.16.1.145 - 18.16.1.144	18.16.1.145
18.16.1.146	18.16.1.147 - 18.16.1.146	18.16.1.147
18.16.1.148	18.16.1.149 - 18.16.1.148	18.16.1.149
18.16.1.150	18.16.1.151 - 18.16.1.150	18.16.1.151
18.16.1.152	18.16.1.153 - 18.16.1.152	18.16.1.153
18.16.1.154	18.16.1.155 - 18.16.1.154	18.16.1.155
18.16.1.156	18.16.1.157 - 18.16.1.156	18.16.1.157
18.16.1.158	18.16.1.159 - 18.16.1.158	18.16.1.159
18.16.1.160	18.16.1.161 - 18.16.1.160	18.16.1.161
18.16.1.162	18.16.1.163 - 18.16.1.162	18.16.1.163
18.16.1.164	18.16.1.165 - 18.16.1.164	18.16.1.165
18.16.1.166	18.16.1.167 - 18.16.1.166	18.16.1.167
18.16.1.168	18.16.1.169 - 18.16.1.168	18.16.1.169
18.16.1.170	18.16.1.171 - 18.16.1.170	18.16.1.171
18.16.1.172	18.16.1.173 - 18.16.1.172	18.16.1.173
18.16.1.174	18.16.1.175 - 18.16.1.174	18.16.1.175
18.16.1.176	18.16.1.177 - 18.16.1.176	18.16.1.177
18.16.1.178	18.16.1.179 - 18.16.1.178	18.16.1.179
18.16.1.180	18.16.1.181 - 18.16.1.180	18.16.1.181
18.16.1.182	18.16.1.183 - 18.16.1.182	18.16.1.183
18.16.1.184	18.16.1.185 - 18.16.1.184	18.16.1.185
18.16.1.186	18.16.1.187 - 18.16.1.186	18.16.1.187
18.16.1.188	18.16.1.189 - 18.16.1.188	18.16.1.189
18.16.1.190	18.16.1.191 - 18.16.1.190	18.16.1.191
18.16.1.192	18.16.1.193 - 18.16.1.192	18.16.1.193
18.16.1.194	18.16.1.195 - 18.16.1.194	18.16.1.195
18.16.1.196	18.16.1.197 - 18.16.1.196	18.16.1.197
18.16.1.198	18.16.1.199 - 18.16.1.198	18.16.1.199
18.16.1.200	18.16.1.201 - 18.16.1.200	18.16.1.201
18.16.1.202	18.16.1.203 - 18.16.1.202	18.16.1.203
18.16.1.204	18.16.1.205 - 18.16.1.204	18.16.1.205
18.16.1.206	18.16.1.207 - 18.16.1.206	18.16.1.207
18.16.1.208	18.16.1.209 - 18.16.1.208	18.16.1.209
18.16.1.210	18.16.1.211 - 18.16.1.210	18.16.1.211
18.16.1.212	18.16.1.213 - 18.16.1.212	18.16.1.213
18.16.1.214	18.16.1.215 - 18.16.1.214	18.16.1.215
18.16.1.216	18.16.1.217 - 18.16.1.216	18.16.1.217
18.16.1.218	18.16.1.219 - 18.16.1.218	18.16.1.219
18.16.1.220	18.16.1.221 - 18.16.1.220	18.16.1.221
18.16.1.222	18.16.1.223 - 18.16.1.222	18.16.1.223
18.16.1.224	18.16.1.225 - 18.16.1.224	18.16.1.225
18.16.1.226	18.16.1.227 - 18.16.1.226	18.16.1.227
18.16.1.228	18.16.1.229 - 18.16.1.228	18.16.1.229
18.16.1.230	18.16.1.231 - 18.16.1.230	18.16.1.231
18.16.1.232	18.16.1.233 - 18.16.1.232	18.16.1.233
18.16.1.234	18.16.1.235 - 18.16.1.234	18.16.1.235
18.16.1.236	18.16.1.237 - 18.16.1.236	18.16.1.237
18.16.1.238	18.16.1.239 - 18.16.1.238	18.16.1.239
18.16.1.240	18.16.1.241 - 18.16.1.240	18.16.1.241
18.16.1.242	18.16.1.243 - 18.16.1.242	18.16.1.243
18.16.1.244	18.16.1.245 - 18.16.1.244	18.16.1.245
18.16.1.246	18.16.1.247 - 18.16.1.246	18.16.1.247
18.16.1.248	18.16.1.249 - 18.16.1.248	18.16.1.249
18.16.1.250	18.16.1.251 - 18.16.1.250	18.16.1.251
18.16.1.252	18.16.1.253 - 18.16.1.252	18.16.1.253
18.16.1.254	18.16.1.255 - 18.16.1.254	18.16.1.255

IPv6 Subnet Calculator

Related

Bandwidth Calculator | Binary Calculator

A subnet is a division of an IP network (internet protocol suite), where an IP network is a set of communications protocols used on the Internet and other similar networks. It is commonly known as TCP/IP (Transmission Control Protocol/Internet Protocol).

The act of dividing a network into at least two separate networks is called subnetting, and routers are devices that allow traffic exchange between subnetworks, serving as a physical boundary. IPv4 is the most common network addressing architecture used, though the use of IPv6 has been growing since 2006.

An IP address is comprised of a network number (routing prefix) and a rest field (host identifier). A rest field is an identifier that is specific to a given host or network interface. A routing prefix is often expressed using Classless Inter-Domain Routing (CIDR) notation for both IPv4 and IPv6. CIDR is a method used to create unique identifiers for networks, as well as individual devices. For IPv4, networks can also be characterized using a subnet mask, which is sometimes expressed in dot-decimal notation, as shown in the "Subnet" field in the calculator. All hosts on a subnetwork have the same network prefix, unlike the host identifier, which is a unique local identification. In IPv4, these subnet masks are used to differentiate the network number and host identifier. In IPv6, the network prefix performs a similar function as the subnet mask in IPv4, with the prefix length representing the number of bits in the address.

Prior to the introduction of CIDR, IPv4 network prefixes could be directly obtained from the IP address based on the class (A, B, or C, which vary based on the range of IP addresses they include) of the address and the network mask. Since the introduction of CIDRs, however, assigning an IP address to a network interface requires both an address and its network mask.

Below is a table providing typical subnets for IPv4.

Prefix size	Network mask	Usable hosts per subnet
/1	128.0.0.0	2,147,483,646
/2	192.0.0.0	1,073,741,822
/3	224.0.0.0	536,870,910
/4	240.0.0.0	268,435,454
/5	248.0.0.0	134,217,726
/6	252.0.0.0	67,108,862
/7	254.0.0.0	33,554,430
Class A
/8	255.0.0.0	16,777,214
/9	255.128.0.0	8,388,606
/10	255.192.0.0	4,194,302
/11	255.224.0.0	2,097,150
/12	255.240.0.0	1,048,574
/13	255.248.0.0	524,286
/14	255.252.0.0	262,142
/15	255.254.0.0	131,070
Class B
/16	255.255.0.0	65,534
/17	255.255.128.0	32,766
/18	255.255.192.0	16,382
/19	255.255.224.0	8,190
/20	255.255.240.0	4,094
/21	255.255.248.0	2,046
/22	255.255.252.0	1,022
/23	255.255.254.0	510
Class C
/24	255.255.255.0	254
/25	255.255.255.128	126
/26	255.255.255.192	62
/27	255.255.255.224	30
/28	255.255.255.240	14
/29	255.255.255.248	6
/30	255.255.255.252	2
/31	255.255.255.254	0
/32	255.255.255.255	0

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