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)10.0.249.0/24

network10.0.249.0/24

broadcast10.0.249.255

first host10.0.249.1

last host10.0.249.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.249.0/24

address00001010.00000000.11111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11111001.00000000

broadcast00001010.00000000.11111001.11111111

green = network part, grey = host part

hex0x0a00f900

decimal167835904

reverse dns0.249.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:f900

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.249.0/31	10.0.249.0 – 10.0.249.1	10.0.249.1
2	10.0.249.2/31	10.0.249.2 – 10.0.249.3	10.0.249.3
3	10.0.249.4/31	10.0.249.4 – 10.0.249.5	10.0.249.5
4	10.0.249.6/31	10.0.249.6 – 10.0.249.7	10.0.249.7
5	10.0.249.8/31	10.0.249.8 – 10.0.249.9	10.0.249.9
6	10.0.249.10/31	10.0.249.10 – 10.0.249.11	10.0.249.11
7	10.0.249.12/31	10.0.249.12 – 10.0.249.13	10.0.249.13
8	10.0.249.14/31	10.0.249.14 – 10.0.249.15	10.0.249.15
9	10.0.249.16/31	10.0.249.16 – 10.0.249.17	10.0.249.17
10	10.0.249.18/31	10.0.249.18 – 10.0.249.19	10.0.249.19
11	10.0.249.20/31	10.0.249.20 – 10.0.249.21	10.0.249.21
12	10.0.249.22/31	10.0.249.22 – 10.0.249.23	10.0.249.23
13	10.0.249.24/31	10.0.249.24 – 10.0.249.25	10.0.249.25
14	10.0.249.26/31	10.0.249.26 – 10.0.249.27	10.0.249.27
15	10.0.249.28/31	10.0.249.28 – 10.0.249.29	10.0.249.29
16	10.0.249.30/31	10.0.249.30 – 10.0.249.31	10.0.249.31
17	10.0.249.32/31	10.0.249.32 – 10.0.249.33	10.0.249.33
18	10.0.249.34/31	10.0.249.34 – 10.0.249.35	10.0.249.35
19	10.0.249.36/31	10.0.249.36 – 10.0.249.37	10.0.249.37
20	10.0.249.38/31	10.0.249.38 – 10.0.249.39	10.0.249.39
21	10.0.249.40/31	10.0.249.40 – 10.0.249.41	10.0.249.41
22	10.0.249.42/31	10.0.249.42 – 10.0.249.43	10.0.249.43
23	10.0.249.44/31	10.0.249.44 – 10.0.249.45	10.0.249.45
24	10.0.249.46/31	10.0.249.46 – 10.0.249.47	10.0.249.47
25	10.0.249.48/31	10.0.249.48 – 10.0.249.49	10.0.249.49
26	10.0.249.50/31	10.0.249.50 – 10.0.249.51	10.0.249.51
27	10.0.249.52/31	10.0.249.52 – 10.0.249.53	10.0.249.53
28	10.0.249.54/31	10.0.249.54 – 10.0.249.55	10.0.249.55
29	10.0.249.56/31	10.0.249.56 – 10.0.249.57	10.0.249.57
30	10.0.249.58/31	10.0.249.58 – 10.0.249.59	10.0.249.59
31	10.0.249.60/31	10.0.249.60 – 10.0.249.61	10.0.249.61
32	10.0.249.62/31	10.0.249.62 – 10.0.249.63	10.0.249.63
33	10.0.249.64/31	10.0.249.64 – 10.0.249.65	10.0.249.65
34	10.0.249.66/31	10.0.249.66 – 10.0.249.67	10.0.249.67
35	10.0.249.68/31	10.0.249.68 – 10.0.249.69	10.0.249.69
36	10.0.249.70/31	10.0.249.70 – 10.0.249.71	10.0.249.71
37	10.0.249.72/31	10.0.249.72 – 10.0.249.73	10.0.249.73
38	10.0.249.74/31	10.0.249.74 – 10.0.249.75	10.0.249.75
39	10.0.249.76/31	10.0.249.76 – 10.0.249.77	10.0.249.77
40	10.0.249.78/31	10.0.249.78 – 10.0.249.79	10.0.249.79
41	10.0.249.80/31	10.0.249.80 – 10.0.249.81	10.0.249.81
42	10.0.249.82/31	10.0.249.82 – 10.0.249.83	10.0.249.83
43	10.0.249.84/31	10.0.249.84 – 10.0.249.85	10.0.249.85
44	10.0.249.86/31	10.0.249.86 – 10.0.249.87	10.0.249.87
45	10.0.249.88/31	10.0.249.88 – 10.0.249.89	10.0.249.89
46	10.0.249.90/31	10.0.249.90 – 10.0.249.91	10.0.249.91
47	10.0.249.92/31	10.0.249.92 – 10.0.249.93	10.0.249.93
48	10.0.249.94/31	10.0.249.94 – 10.0.249.95	10.0.249.95
49	10.0.249.96/31	10.0.249.96 – 10.0.249.97	10.0.249.97
50	10.0.249.98/31	10.0.249.98 – 10.0.249.99	10.0.249.99
51	10.0.249.100/31	10.0.249.100 – 10.0.249.101	10.0.249.101
52	10.0.249.102/31	10.0.249.102 – 10.0.249.103	10.0.249.103
53	10.0.249.104/31	10.0.249.104 – 10.0.249.105	10.0.249.105
54	10.0.249.106/31	10.0.249.106 – 10.0.249.107	10.0.249.107
55	10.0.249.108/31	10.0.249.108 – 10.0.249.109	10.0.249.109
56	10.0.249.110/31	10.0.249.110 – 10.0.249.111	10.0.249.111
57	10.0.249.112/31	10.0.249.112 – 10.0.249.113	10.0.249.113
58	10.0.249.114/31	10.0.249.114 – 10.0.249.115	10.0.249.115
59	10.0.249.116/31	10.0.249.116 – 10.0.249.117	10.0.249.117
60	10.0.249.118/31	10.0.249.118 – 10.0.249.119	10.0.249.119
61	10.0.249.120/31	10.0.249.120 – 10.0.249.121	10.0.249.121
62	10.0.249.122/31	10.0.249.122 – 10.0.249.123	10.0.249.123
63	10.0.249.124/31	10.0.249.124 – 10.0.249.125	10.0.249.125
64	10.0.249.126/31	10.0.249.126 – 10.0.249.127	10.0.249.127
65	10.0.249.128/31	10.0.249.128 – 10.0.249.129	10.0.249.129
66	10.0.249.130/31	10.0.249.130 – 10.0.249.131	10.0.249.131
67	10.0.249.132/31	10.0.249.132 – 10.0.249.133	10.0.249.133
68	10.0.249.134/31	10.0.249.134 – 10.0.249.135	10.0.249.135
69	10.0.249.136/31	10.0.249.136 – 10.0.249.137	10.0.249.137
70	10.0.249.138/31	10.0.249.138 – 10.0.249.139	10.0.249.139
71	10.0.249.140/31	10.0.249.140 – 10.0.249.141	10.0.249.141
72	10.0.249.142/31	10.0.249.142 – 10.0.249.143	10.0.249.143
73	10.0.249.144/31	10.0.249.144 – 10.0.249.145	10.0.249.145
74	10.0.249.146/31	10.0.249.146 – 10.0.249.147	10.0.249.147
75	10.0.249.148/31	10.0.249.148 – 10.0.249.149	10.0.249.149
76	10.0.249.150/31	10.0.249.150 – 10.0.249.151	10.0.249.151
77	10.0.249.152/31	10.0.249.152 – 10.0.249.153	10.0.249.153
78	10.0.249.154/31	10.0.249.154 – 10.0.249.155	10.0.249.155
79	10.0.249.156/31	10.0.249.156 – 10.0.249.157	10.0.249.157
80	10.0.249.158/31	10.0.249.158 – 10.0.249.159	10.0.249.159
81	10.0.249.160/31	10.0.249.160 – 10.0.249.161	10.0.249.161
82	10.0.249.162/31	10.0.249.162 – 10.0.249.163	10.0.249.163
83	10.0.249.164/31	10.0.249.164 – 10.0.249.165	10.0.249.165
84	10.0.249.166/31	10.0.249.166 – 10.0.249.167	10.0.249.167
85	10.0.249.168/31	10.0.249.168 – 10.0.249.169	10.0.249.169
86	10.0.249.170/31	10.0.249.170 – 10.0.249.171	10.0.249.171
87	10.0.249.172/31	10.0.249.172 – 10.0.249.173	10.0.249.173
88	10.0.249.174/31	10.0.249.174 – 10.0.249.175	10.0.249.175
89	10.0.249.176/31	10.0.249.176 – 10.0.249.177	10.0.249.177
90	10.0.249.178/31	10.0.249.178 – 10.0.249.179	10.0.249.179
91	10.0.249.180/31	10.0.249.180 – 10.0.249.181	10.0.249.181
92	10.0.249.182/31	10.0.249.182 – 10.0.249.183	10.0.249.183
93	10.0.249.184/31	10.0.249.184 – 10.0.249.185	10.0.249.185
94	10.0.249.186/31	10.0.249.186 – 10.0.249.187	10.0.249.187
95	10.0.249.188/31	10.0.249.188 – 10.0.249.189	10.0.249.189
96	10.0.249.190/31	10.0.249.190 – 10.0.249.191	10.0.249.191
97	10.0.249.192/31	10.0.249.192 – 10.0.249.193	10.0.249.193
98	10.0.249.194/31	10.0.249.194 – 10.0.249.195	10.0.249.195
99	10.0.249.196/31	10.0.249.196 – 10.0.249.197	10.0.249.197
100	10.0.249.198/31	10.0.249.198 – 10.0.249.199	10.0.249.199
101	10.0.249.200/31	10.0.249.200 – 10.0.249.201	10.0.249.201
102	10.0.249.202/31	10.0.249.202 – 10.0.249.203	10.0.249.203
103	10.0.249.204/31	10.0.249.204 – 10.0.249.205	10.0.249.205
104	10.0.249.206/31	10.0.249.206 – 10.0.249.207	10.0.249.207
105	10.0.249.208/31	10.0.249.208 – 10.0.249.209	10.0.249.209
106	10.0.249.210/31	10.0.249.210 – 10.0.249.211	10.0.249.211
107	10.0.249.212/31	10.0.249.212 – 10.0.249.213	10.0.249.213
108	10.0.249.214/31	10.0.249.214 – 10.0.249.215	10.0.249.215
109	10.0.249.216/31	10.0.249.216 – 10.0.249.217	10.0.249.217
110	10.0.249.218/31	10.0.249.218 – 10.0.249.219	10.0.249.219
111	10.0.249.220/31	10.0.249.220 – 10.0.249.221	10.0.249.221
112	10.0.249.222/31	10.0.249.222 – 10.0.249.223	10.0.249.223
113	10.0.249.224/31	10.0.249.224 – 10.0.249.225	10.0.249.225
114	10.0.249.226/31	10.0.249.226 – 10.0.249.227	10.0.249.227
115	10.0.249.228/31	10.0.249.228 – 10.0.249.229	10.0.249.229
116	10.0.249.230/31	10.0.249.230 – 10.0.249.231	10.0.249.231
117	10.0.249.232/31	10.0.249.232 – 10.0.249.233	10.0.249.233
118	10.0.249.234/31	10.0.249.234 – 10.0.249.235	10.0.249.235
119	10.0.249.236/31	10.0.249.236 – 10.0.249.237	10.0.249.237
120	10.0.249.238/31	10.0.249.238 – 10.0.249.239	10.0.249.239
121	10.0.249.240/31	10.0.249.240 – 10.0.249.241	10.0.249.241
122	10.0.249.242/31	10.0.249.242 – 10.0.249.243	10.0.249.243
123	10.0.249.244/31	10.0.249.244 – 10.0.249.245	10.0.249.245
124	10.0.249.246/31	10.0.249.246 – 10.0.249.247	10.0.249.247
125	10.0.249.248/31	10.0.249.248 – 10.0.249.249	10.0.249.249
126	10.0.249.250/31	10.0.249.250 – 10.0.249.251	10.0.249.251
127	10.0.249.252/31	10.0.249.252 – 10.0.249.253	10.0.249.253
128	10.0.249.254/31	10.0.249.254 – 10.0.249.255	10.0.249.255

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 →