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)10.4.34.0/24

network10.4.34.0/24

broadcast10.4.34.255

first host10.4.34.1

last host10.4.34.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.4.34.0/24

address00001010.00000100.00100010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000100.00100010.00000000

broadcast00001010.00000100.00100010.11111111

green = network part, grey = host part

hex0x0a042200

decimal168043008

reverse dns0.34.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:2200

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.34.0/31	10.4.34.0 – 10.4.34.1	10.4.34.1
2	10.4.34.2/31	10.4.34.2 – 10.4.34.3	10.4.34.3
3	10.4.34.4/31	10.4.34.4 – 10.4.34.5	10.4.34.5
4	10.4.34.6/31	10.4.34.6 – 10.4.34.7	10.4.34.7
5	10.4.34.8/31	10.4.34.8 – 10.4.34.9	10.4.34.9
6	10.4.34.10/31	10.4.34.10 – 10.4.34.11	10.4.34.11
7	10.4.34.12/31	10.4.34.12 – 10.4.34.13	10.4.34.13
8	10.4.34.14/31	10.4.34.14 – 10.4.34.15	10.4.34.15
9	10.4.34.16/31	10.4.34.16 – 10.4.34.17	10.4.34.17
10	10.4.34.18/31	10.4.34.18 – 10.4.34.19	10.4.34.19
11	10.4.34.20/31	10.4.34.20 – 10.4.34.21	10.4.34.21
12	10.4.34.22/31	10.4.34.22 – 10.4.34.23	10.4.34.23
13	10.4.34.24/31	10.4.34.24 – 10.4.34.25	10.4.34.25
14	10.4.34.26/31	10.4.34.26 – 10.4.34.27	10.4.34.27
15	10.4.34.28/31	10.4.34.28 – 10.4.34.29	10.4.34.29
16	10.4.34.30/31	10.4.34.30 – 10.4.34.31	10.4.34.31
17	10.4.34.32/31	10.4.34.32 – 10.4.34.33	10.4.34.33
18	10.4.34.34/31	10.4.34.34 – 10.4.34.35	10.4.34.35
19	10.4.34.36/31	10.4.34.36 – 10.4.34.37	10.4.34.37
20	10.4.34.38/31	10.4.34.38 – 10.4.34.39	10.4.34.39
21	10.4.34.40/31	10.4.34.40 – 10.4.34.41	10.4.34.41
22	10.4.34.42/31	10.4.34.42 – 10.4.34.43	10.4.34.43
23	10.4.34.44/31	10.4.34.44 – 10.4.34.45	10.4.34.45
24	10.4.34.46/31	10.4.34.46 – 10.4.34.47	10.4.34.47
25	10.4.34.48/31	10.4.34.48 – 10.4.34.49	10.4.34.49
26	10.4.34.50/31	10.4.34.50 – 10.4.34.51	10.4.34.51
27	10.4.34.52/31	10.4.34.52 – 10.4.34.53	10.4.34.53
28	10.4.34.54/31	10.4.34.54 – 10.4.34.55	10.4.34.55
29	10.4.34.56/31	10.4.34.56 – 10.4.34.57	10.4.34.57
30	10.4.34.58/31	10.4.34.58 – 10.4.34.59	10.4.34.59
31	10.4.34.60/31	10.4.34.60 – 10.4.34.61	10.4.34.61
32	10.4.34.62/31	10.4.34.62 – 10.4.34.63	10.4.34.63
33	10.4.34.64/31	10.4.34.64 – 10.4.34.65	10.4.34.65
34	10.4.34.66/31	10.4.34.66 – 10.4.34.67	10.4.34.67
35	10.4.34.68/31	10.4.34.68 – 10.4.34.69	10.4.34.69
36	10.4.34.70/31	10.4.34.70 – 10.4.34.71	10.4.34.71
37	10.4.34.72/31	10.4.34.72 – 10.4.34.73	10.4.34.73
38	10.4.34.74/31	10.4.34.74 – 10.4.34.75	10.4.34.75
39	10.4.34.76/31	10.4.34.76 – 10.4.34.77	10.4.34.77
40	10.4.34.78/31	10.4.34.78 – 10.4.34.79	10.4.34.79
41	10.4.34.80/31	10.4.34.80 – 10.4.34.81	10.4.34.81
42	10.4.34.82/31	10.4.34.82 – 10.4.34.83	10.4.34.83
43	10.4.34.84/31	10.4.34.84 – 10.4.34.85	10.4.34.85
44	10.4.34.86/31	10.4.34.86 – 10.4.34.87	10.4.34.87
45	10.4.34.88/31	10.4.34.88 – 10.4.34.89	10.4.34.89
46	10.4.34.90/31	10.4.34.90 – 10.4.34.91	10.4.34.91
47	10.4.34.92/31	10.4.34.92 – 10.4.34.93	10.4.34.93
48	10.4.34.94/31	10.4.34.94 – 10.4.34.95	10.4.34.95
49	10.4.34.96/31	10.4.34.96 – 10.4.34.97	10.4.34.97
50	10.4.34.98/31	10.4.34.98 – 10.4.34.99	10.4.34.99
51	10.4.34.100/31	10.4.34.100 – 10.4.34.101	10.4.34.101
52	10.4.34.102/31	10.4.34.102 – 10.4.34.103	10.4.34.103
53	10.4.34.104/31	10.4.34.104 – 10.4.34.105	10.4.34.105
54	10.4.34.106/31	10.4.34.106 – 10.4.34.107	10.4.34.107
55	10.4.34.108/31	10.4.34.108 – 10.4.34.109	10.4.34.109
56	10.4.34.110/31	10.4.34.110 – 10.4.34.111	10.4.34.111
57	10.4.34.112/31	10.4.34.112 – 10.4.34.113	10.4.34.113
58	10.4.34.114/31	10.4.34.114 – 10.4.34.115	10.4.34.115
59	10.4.34.116/31	10.4.34.116 – 10.4.34.117	10.4.34.117
60	10.4.34.118/31	10.4.34.118 – 10.4.34.119	10.4.34.119
61	10.4.34.120/31	10.4.34.120 – 10.4.34.121	10.4.34.121
62	10.4.34.122/31	10.4.34.122 – 10.4.34.123	10.4.34.123
63	10.4.34.124/31	10.4.34.124 – 10.4.34.125	10.4.34.125
64	10.4.34.126/31	10.4.34.126 – 10.4.34.127	10.4.34.127
65	10.4.34.128/31	10.4.34.128 – 10.4.34.129	10.4.34.129
66	10.4.34.130/31	10.4.34.130 – 10.4.34.131	10.4.34.131
67	10.4.34.132/31	10.4.34.132 – 10.4.34.133	10.4.34.133
68	10.4.34.134/31	10.4.34.134 – 10.4.34.135	10.4.34.135
69	10.4.34.136/31	10.4.34.136 – 10.4.34.137	10.4.34.137
70	10.4.34.138/31	10.4.34.138 – 10.4.34.139	10.4.34.139
71	10.4.34.140/31	10.4.34.140 – 10.4.34.141	10.4.34.141
72	10.4.34.142/31	10.4.34.142 – 10.4.34.143	10.4.34.143
73	10.4.34.144/31	10.4.34.144 – 10.4.34.145	10.4.34.145
74	10.4.34.146/31	10.4.34.146 – 10.4.34.147	10.4.34.147
75	10.4.34.148/31	10.4.34.148 – 10.4.34.149	10.4.34.149
76	10.4.34.150/31	10.4.34.150 – 10.4.34.151	10.4.34.151
77	10.4.34.152/31	10.4.34.152 – 10.4.34.153	10.4.34.153
78	10.4.34.154/31	10.4.34.154 – 10.4.34.155	10.4.34.155
79	10.4.34.156/31	10.4.34.156 – 10.4.34.157	10.4.34.157
80	10.4.34.158/31	10.4.34.158 – 10.4.34.159	10.4.34.159
81	10.4.34.160/31	10.4.34.160 – 10.4.34.161	10.4.34.161
82	10.4.34.162/31	10.4.34.162 – 10.4.34.163	10.4.34.163
83	10.4.34.164/31	10.4.34.164 – 10.4.34.165	10.4.34.165
84	10.4.34.166/31	10.4.34.166 – 10.4.34.167	10.4.34.167
85	10.4.34.168/31	10.4.34.168 – 10.4.34.169	10.4.34.169
86	10.4.34.170/31	10.4.34.170 – 10.4.34.171	10.4.34.171
87	10.4.34.172/31	10.4.34.172 – 10.4.34.173	10.4.34.173
88	10.4.34.174/31	10.4.34.174 – 10.4.34.175	10.4.34.175
89	10.4.34.176/31	10.4.34.176 – 10.4.34.177	10.4.34.177
90	10.4.34.178/31	10.4.34.178 – 10.4.34.179	10.4.34.179
91	10.4.34.180/31	10.4.34.180 – 10.4.34.181	10.4.34.181
92	10.4.34.182/31	10.4.34.182 – 10.4.34.183	10.4.34.183
93	10.4.34.184/31	10.4.34.184 – 10.4.34.185	10.4.34.185
94	10.4.34.186/31	10.4.34.186 – 10.4.34.187	10.4.34.187
95	10.4.34.188/31	10.4.34.188 – 10.4.34.189	10.4.34.189
96	10.4.34.190/31	10.4.34.190 – 10.4.34.191	10.4.34.191
97	10.4.34.192/31	10.4.34.192 – 10.4.34.193	10.4.34.193
98	10.4.34.194/31	10.4.34.194 – 10.4.34.195	10.4.34.195
99	10.4.34.196/31	10.4.34.196 – 10.4.34.197	10.4.34.197
100	10.4.34.198/31	10.4.34.198 – 10.4.34.199	10.4.34.199
101	10.4.34.200/31	10.4.34.200 – 10.4.34.201	10.4.34.201
102	10.4.34.202/31	10.4.34.202 – 10.4.34.203	10.4.34.203
103	10.4.34.204/31	10.4.34.204 – 10.4.34.205	10.4.34.205
104	10.4.34.206/31	10.4.34.206 – 10.4.34.207	10.4.34.207
105	10.4.34.208/31	10.4.34.208 – 10.4.34.209	10.4.34.209
106	10.4.34.210/31	10.4.34.210 – 10.4.34.211	10.4.34.211
107	10.4.34.212/31	10.4.34.212 – 10.4.34.213	10.4.34.213
108	10.4.34.214/31	10.4.34.214 – 10.4.34.215	10.4.34.215
109	10.4.34.216/31	10.4.34.216 – 10.4.34.217	10.4.34.217
110	10.4.34.218/31	10.4.34.218 – 10.4.34.219	10.4.34.219
111	10.4.34.220/31	10.4.34.220 – 10.4.34.221	10.4.34.221
112	10.4.34.222/31	10.4.34.222 – 10.4.34.223	10.4.34.223
113	10.4.34.224/31	10.4.34.224 – 10.4.34.225	10.4.34.225
114	10.4.34.226/31	10.4.34.226 – 10.4.34.227	10.4.34.227
115	10.4.34.228/31	10.4.34.228 – 10.4.34.229	10.4.34.229
116	10.4.34.230/31	10.4.34.230 – 10.4.34.231	10.4.34.231
117	10.4.34.232/31	10.4.34.232 – 10.4.34.233	10.4.34.233
118	10.4.34.234/31	10.4.34.234 – 10.4.34.235	10.4.34.235
119	10.4.34.236/31	10.4.34.236 – 10.4.34.237	10.4.34.237
120	10.4.34.238/31	10.4.34.238 – 10.4.34.239	10.4.34.239
121	10.4.34.240/31	10.4.34.240 – 10.4.34.241	10.4.34.241
122	10.4.34.242/31	10.4.34.242 – 10.4.34.243	10.4.34.243
123	10.4.34.244/31	10.4.34.244 – 10.4.34.245	10.4.34.245
124	10.4.34.246/31	10.4.34.246 – 10.4.34.247	10.4.34.247
125	10.4.34.248/31	10.4.34.248 – 10.4.34.249	10.4.34.249
126	10.4.34.250/31	10.4.34.250 – 10.4.34.251	10.4.34.251
127	10.4.34.252/31	10.4.34.252 – 10.4.34.253	10.4.34.253
128	10.4.34.254/31	10.4.34.254 – 10.4.34.255	10.4.34.255

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 →