IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.2.102.0/24

network10.2.102.0/24

broadcast10.2.102.255

first host10.2.102.1

last host10.2.102.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.102.0/24

address00001010.00000010.01100110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.01100110.00000000

broadcast00001010.00000010.01100110.11111111

green = network part, grey = host part

hex0x0a026600

decimal167929344

reverse dns0.102.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:6600

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.102.0/31	10.2.102.0 – 10.2.102.1	10.2.102.1
2	10.2.102.2/31	10.2.102.2 – 10.2.102.3	10.2.102.3
3	10.2.102.4/31	10.2.102.4 – 10.2.102.5	10.2.102.5
4	10.2.102.6/31	10.2.102.6 – 10.2.102.7	10.2.102.7
5	10.2.102.8/31	10.2.102.8 – 10.2.102.9	10.2.102.9
6	10.2.102.10/31	10.2.102.10 – 10.2.102.11	10.2.102.11
7	10.2.102.12/31	10.2.102.12 – 10.2.102.13	10.2.102.13
8	10.2.102.14/31	10.2.102.14 – 10.2.102.15	10.2.102.15
9	10.2.102.16/31	10.2.102.16 – 10.2.102.17	10.2.102.17
10	10.2.102.18/31	10.2.102.18 – 10.2.102.19	10.2.102.19
11	10.2.102.20/31	10.2.102.20 – 10.2.102.21	10.2.102.21
12	10.2.102.22/31	10.2.102.22 – 10.2.102.23	10.2.102.23
13	10.2.102.24/31	10.2.102.24 – 10.2.102.25	10.2.102.25
14	10.2.102.26/31	10.2.102.26 – 10.2.102.27	10.2.102.27
15	10.2.102.28/31	10.2.102.28 – 10.2.102.29	10.2.102.29
16	10.2.102.30/31	10.2.102.30 – 10.2.102.31	10.2.102.31
17	10.2.102.32/31	10.2.102.32 – 10.2.102.33	10.2.102.33
18	10.2.102.34/31	10.2.102.34 – 10.2.102.35	10.2.102.35
19	10.2.102.36/31	10.2.102.36 – 10.2.102.37	10.2.102.37
20	10.2.102.38/31	10.2.102.38 – 10.2.102.39	10.2.102.39
21	10.2.102.40/31	10.2.102.40 – 10.2.102.41	10.2.102.41
22	10.2.102.42/31	10.2.102.42 – 10.2.102.43	10.2.102.43
23	10.2.102.44/31	10.2.102.44 – 10.2.102.45	10.2.102.45
24	10.2.102.46/31	10.2.102.46 – 10.2.102.47	10.2.102.47
25	10.2.102.48/31	10.2.102.48 – 10.2.102.49	10.2.102.49
26	10.2.102.50/31	10.2.102.50 – 10.2.102.51	10.2.102.51
27	10.2.102.52/31	10.2.102.52 – 10.2.102.53	10.2.102.53
28	10.2.102.54/31	10.2.102.54 – 10.2.102.55	10.2.102.55
29	10.2.102.56/31	10.2.102.56 – 10.2.102.57	10.2.102.57
30	10.2.102.58/31	10.2.102.58 – 10.2.102.59	10.2.102.59
31	10.2.102.60/31	10.2.102.60 – 10.2.102.61	10.2.102.61
32	10.2.102.62/31	10.2.102.62 – 10.2.102.63	10.2.102.63
33	10.2.102.64/31	10.2.102.64 – 10.2.102.65	10.2.102.65
34	10.2.102.66/31	10.2.102.66 – 10.2.102.67	10.2.102.67
35	10.2.102.68/31	10.2.102.68 – 10.2.102.69	10.2.102.69
36	10.2.102.70/31	10.2.102.70 – 10.2.102.71	10.2.102.71
37	10.2.102.72/31	10.2.102.72 – 10.2.102.73	10.2.102.73
38	10.2.102.74/31	10.2.102.74 – 10.2.102.75	10.2.102.75
39	10.2.102.76/31	10.2.102.76 – 10.2.102.77	10.2.102.77
40	10.2.102.78/31	10.2.102.78 – 10.2.102.79	10.2.102.79
41	10.2.102.80/31	10.2.102.80 – 10.2.102.81	10.2.102.81
42	10.2.102.82/31	10.2.102.82 – 10.2.102.83	10.2.102.83
43	10.2.102.84/31	10.2.102.84 – 10.2.102.85	10.2.102.85
44	10.2.102.86/31	10.2.102.86 – 10.2.102.87	10.2.102.87
45	10.2.102.88/31	10.2.102.88 – 10.2.102.89	10.2.102.89
46	10.2.102.90/31	10.2.102.90 – 10.2.102.91	10.2.102.91
47	10.2.102.92/31	10.2.102.92 – 10.2.102.93	10.2.102.93
48	10.2.102.94/31	10.2.102.94 – 10.2.102.95	10.2.102.95
49	10.2.102.96/31	10.2.102.96 – 10.2.102.97	10.2.102.97
50	10.2.102.98/31	10.2.102.98 – 10.2.102.99	10.2.102.99
51	10.2.102.100/31	10.2.102.100 – 10.2.102.101	10.2.102.101
52	10.2.102.102/31	10.2.102.102 – 10.2.102.103	10.2.102.103
53	10.2.102.104/31	10.2.102.104 – 10.2.102.105	10.2.102.105
54	10.2.102.106/31	10.2.102.106 – 10.2.102.107	10.2.102.107
55	10.2.102.108/31	10.2.102.108 – 10.2.102.109	10.2.102.109
56	10.2.102.110/31	10.2.102.110 – 10.2.102.111	10.2.102.111
57	10.2.102.112/31	10.2.102.112 – 10.2.102.113	10.2.102.113
58	10.2.102.114/31	10.2.102.114 – 10.2.102.115	10.2.102.115
59	10.2.102.116/31	10.2.102.116 – 10.2.102.117	10.2.102.117
60	10.2.102.118/31	10.2.102.118 – 10.2.102.119	10.2.102.119
61	10.2.102.120/31	10.2.102.120 – 10.2.102.121	10.2.102.121
62	10.2.102.122/31	10.2.102.122 – 10.2.102.123	10.2.102.123
63	10.2.102.124/31	10.2.102.124 – 10.2.102.125	10.2.102.125
64	10.2.102.126/31	10.2.102.126 – 10.2.102.127	10.2.102.127
65	10.2.102.128/31	10.2.102.128 – 10.2.102.129	10.2.102.129
66	10.2.102.130/31	10.2.102.130 – 10.2.102.131	10.2.102.131
67	10.2.102.132/31	10.2.102.132 – 10.2.102.133	10.2.102.133
68	10.2.102.134/31	10.2.102.134 – 10.2.102.135	10.2.102.135
69	10.2.102.136/31	10.2.102.136 – 10.2.102.137	10.2.102.137
70	10.2.102.138/31	10.2.102.138 – 10.2.102.139	10.2.102.139
71	10.2.102.140/31	10.2.102.140 – 10.2.102.141	10.2.102.141
72	10.2.102.142/31	10.2.102.142 – 10.2.102.143	10.2.102.143
73	10.2.102.144/31	10.2.102.144 – 10.2.102.145	10.2.102.145
74	10.2.102.146/31	10.2.102.146 – 10.2.102.147	10.2.102.147
75	10.2.102.148/31	10.2.102.148 – 10.2.102.149	10.2.102.149
76	10.2.102.150/31	10.2.102.150 – 10.2.102.151	10.2.102.151
77	10.2.102.152/31	10.2.102.152 – 10.2.102.153	10.2.102.153
78	10.2.102.154/31	10.2.102.154 – 10.2.102.155	10.2.102.155
79	10.2.102.156/31	10.2.102.156 – 10.2.102.157	10.2.102.157
80	10.2.102.158/31	10.2.102.158 – 10.2.102.159	10.2.102.159
81	10.2.102.160/31	10.2.102.160 – 10.2.102.161	10.2.102.161
82	10.2.102.162/31	10.2.102.162 – 10.2.102.163	10.2.102.163
83	10.2.102.164/31	10.2.102.164 – 10.2.102.165	10.2.102.165
84	10.2.102.166/31	10.2.102.166 – 10.2.102.167	10.2.102.167
85	10.2.102.168/31	10.2.102.168 – 10.2.102.169	10.2.102.169
86	10.2.102.170/31	10.2.102.170 – 10.2.102.171	10.2.102.171
87	10.2.102.172/31	10.2.102.172 – 10.2.102.173	10.2.102.173
88	10.2.102.174/31	10.2.102.174 – 10.2.102.175	10.2.102.175
89	10.2.102.176/31	10.2.102.176 – 10.2.102.177	10.2.102.177
90	10.2.102.178/31	10.2.102.178 – 10.2.102.179	10.2.102.179
91	10.2.102.180/31	10.2.102.180 – 10.2.102.181	10.2.102.181
92	10.2.102.182/31	10.2.102.182 – 10.2.102.183	10.2.102.183
93	10.2.102.184/31	10.2.102.184 – 10.2.102.185	10.2.102.185
94	10.2.102.186/31	10.2.102.186 – 10.2.102.187	10.2.102.187
95	10.2.102.188/31	10.2.102.188 – 10.2.102.189	10.2.102.189
96	10.2.102.190/31	10.2.102.190 – 10.2.102.191	10.2.102.191
97	10.2.102.192/31	10.2.102.192 – 10.2.102.193	10.2.102.193
98	10.2.102.194/31	10.2.102.194 – 10.2.102.195	10.2.102.195
99	10.2.102.196/31	10.2.102.196 – 10.2.102.197	10.2.102.197
100	10.2.102.198/31	10.2.102.198 – 10.2.102.199	10.2.102.199
101	10.2.102.200/31	10.2.102.200 – 10.2.102.201	10.2.102.201
102	10.2.102.202/31	10.2.102.202 – 10.2.102.203	10.2.102.203
103	10.2.102.204/31	10.2.102.204 – 10.2.102.205	10.2.102.205
104	10.2.102.206/31	10.2.102.206 – 10.2.102.207	10.2.102.207
105	10.2.102.208/31	10.2.102.208 – 10.2.102.209	10.2.102.209
106	10.2.102.210/31	10.2.102.210 – 10.2.102.211	10.2.102.211
107	10.2.102.212/31	10.2.102.212 – 10.2.102.213	10.2.102.213
108	10.2.102.214/31	10.2.102.214 – 10.2.102.215	10.2.102.215
109	10.2.102.216/31	10.2.102.216 – 10.2.102.217	10.2.102.217
110	10.2.102.218/31	10.2.102.218 – 10.2.102.219	10.2.102.219
111	10.2.102.220/31	10.2.102.220 – 10.2.102.221	10.2.102.221
112	10.2.102.222/31	10.2.102.222 – 10.2.102.223	10.2.102.223
113	10.2.102.224/31	10.2.102.224 – 10.2.102.225	10.2.102.225
114	10.2.102.226/31	10.2.102.226 – 10.2.102.227	10.2.102.227
115	10.2.102.228/31	10.2.102.228 – 10.2.102.229	10.2.102.229
116	10.2.102.230/31	10.2.102.230 – 10.2.102.231	10.2.102.231
117	10.2.102.232/31	10.2.102.232 – 10.2.102.233	10.2.102.233
118	10.2.102.234/31	10.2.102.234 – 10.2.102.235	10.2.102.235
119	10.2.102.236/31	10.2.102.236 – 10.2.102.237	10.2.102.237
120	10.2.102.238/31	10.2.102.238 – 10.2.102.239	10.2.102.239
121	10.2.102.240/31	10.2.102.240 – 10.2.102.241	10.2.102.241
122	10.2.102.242/31	10.2.102.242 – 10.2.102.243	10.2.102.243
123	10.2.102.244/31	10.2.102.244 – 10.2.102.245	10.2.102.245
124	10.2.102.246/31	10.2.102.246 – 10.2.102.247	10.2.102.247
125	10.2.102.248/31	10.2.102.248 – 10.2.102.249	10.2.102.249
126	10.2.102.250/31	10.2.102.250 – 10.2.102.251	10.2.102.251
127	10.2.102.252/31	10.2.102.252 – 10.2.102.253	10.2.102.253
128	10.2.102.254/31	10.2.102.254 – 10.2.102.255	10.2.102.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /24
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →