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)10.2.254.0/24

network10.2.254.0/24

broadcast10.2.254.255

first host10.2.254.1

last host10.2.254.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.254.0/24

address00001010.00000010.11111110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11111110.00000000

broadcast00001010.00000010.11111110.11111111

green = network part, grey = host part

hex0x0a02fe00

decimal167968256

reverse dns0.254.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:fe00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.254.0/31	10.2.254.0 – 10.2.254.1	10.2.254.1
2	10.2.254.2/31	10.2.254.2 – 10.2.254.3	10.2.254.3
3	10.2.254.4/31	10.2.254.4 – 10.2.254.5	10.2.254.5
4	10.2.254.6/31	10.2.254.6 – 10.2.254.7	10.2.254.7
5	10.2.254.8/31	10.2.254.8 – 10.2.254.9	10.2.254.9
6	10.2.254.10/31	10.2.254.10 – 10.2.254.11	10.2.254.11
7	10.2.254.12/31	10.2.254.12 – 10.2.254.13	10.2.254.13
8	10.2.254.14/31	10.2.254.14 – 10.2.254.15	10.2.254.15
9	10.2.254.16/31	10.2.254.16 – 10.2.254.17	10.2.254.17
10	10.2.254.18/31	10.2.254.18 – 10.2.254.19	10.2.254.19
11	10.2.254.20/31	10.2.254.20 – 10.2.254.21	10.2.254.21
12	10.2.254.22/31	10.2.254.22 – 10.2.254.23	10.2.254.23
13	10.2.254.24/31	10.2.254.24 – 10.2.254.25	10.2.254.25
14	10.2.254.26/31	10.2.254.26 – 10.2.254.27	10.2.254.27
15	10.2.254.28/31	10.2.254.28 – 10.2.254.29	10.2.254.29
16	10.2.254.30/31	10.2.254.30 – 10.2.254.31	10.2.254.31
17	10.2.254.32/31	10.2.254.32 – 10.2.254.33	10.2.254.33
18	10.2.254.34/31	10.2.254.34 – 10.2.254.35	10.2.254.35
19	10.2.254.36/31	10.2.254.36 – 10.2.254.37	10.2.254.37
20	10.2.254.38/31	10.2.254.38 – 10.2.254.39	10.2.254.39
21	10.2.254.40/31	10.2.254.40 – 10.2.254.41	10.2.254.41
22	10.2.254.42/31	10.2.254.42 – 10.2.254.43	10.2.254.43
23	10.2.254.44/31	10.2.254.44 – 10.2.254.45	10.2.254.45
24	10.2.254.46/31	10.2.254.46 – 10.2.254.47	10.2.254.47
25	10.2.254.48/31	10.2.254.48 – 10.2.254.49	10.2.254.49
26	10.2.254.50/31	10.2.254.50 – 10.2.254.51	10.2.254.51
27	10.2.254.52/31	10.2.254.52 – 10.2.254.53	10.2.254.53
28	10.2.254.54/31	10.2.254.54 – 10.2.254.55	10.2.254.55
29	10.2.254.56/31	10.2.254.56 – 10.2.254.57	10.2.254.57
30	10.2.254.58/31	10.2.254.58 – 10.2.254.59	10.2.254.59
31	10.2.254.60/31	10.2.254.60 – 10.2.254.61	10.2.254.61
32	10.2.254.62/31	10.2.254.62 – 10.2.254.63	10.2.254.63
33	10.2.254.64/31	10.2.254.64 – 10.2.254.65	10.2.254.65
34	10.2.254.66/31	10.2.254.66 – 10.2.254.67	10.2.254.67
35	10.2.254.68/31	10.2.254.68 – 10.2.254.69	10.2.254.69
36	10.2.254.70/31	10.2.254.70 – 10.2.254.71	10.2.254.71
37	10.2.254.72/31	10.2.254.72 – 10.2.254.73	10.2.254.73
38	10.2.254.74/31	10.2.254.74 – 10.2.254.75	10.2.254.75
39	10.2.254.76/31	10.2.254.76 – 10.2.254.77	10.2.254.77
40	10.2.254.78/31	10.2.254.78 – 10.2.254.79	10.2.254.79
41	10.2.254.80/31	10.2.254.80 – 10.2.254.81	10.2.254.81
42	10.2.254.82/31	10.2.254.82 – 10.2.254.83	10.2.254.83
43	10.2.254.84/31	10.2.254.84 – 10.2.254.85	10.2.254.85
44	10.2.254.86/31	10.2.254.86 – 10.2.254.87	10.2.254.87
45	10.2.254.88/31	10.2.254.88 – 10.2.254.89	10.2.254.89
46	10.2.254.90/31	10.2.254.90 – 10.2.254.91	10.2.254.91
47	10.2.254.92/31	10.2.254.92 – 10.2.254.93	10.2.254.93
48	10.2.254.94/31	10.2.254.94 – 10.2.254.95	10.2.254.95
49	10.2.254.96/31	10.2.254.96 – 10.2.254.97	10.2.254.97
50	10.2.254.98/31	10.2.254.98 – 10.2.254.99	10.2.254.99
51	10.2.254.100/31	10.2.254.100 – 10.2.254.101	10.2.254.101
52	10.2.254.102/31	10.2.254.102 – 10.2.254.103	10.2.254.103
53	10.2.254.104/31	10.2.254.104 – 10.2.254.105	10.2.254.105
54	10.2.254.106/31	10.2.254.106 – 10.2.254.107	10.2.254.107
55	10.2.254.108/31	10.2.254.108 – 10.2.254.109	10.2.254.109
56	10.2.254.110/31	10.2.254.110 – 10.2.254.111	10.2.254.111
57	10.2.254.112/31	10.2.254.112 – 10.2.254.113	10.2.254.113
58	10.2.254.114/31	10.2.254.114 – 10.2.254.115	10.2.254.115
59	10.2.254.116/31	10.2.254.116 – 10.2.254.117	10.2.254.117
60	10.2.254.118/31	10.2.254.118 – 10.2.254.119	10.2.254.119
61	10.2.254.120/31	10.2.254.120 – 10.2.254.121	10.2.254.121
62	10.2.254.122/31	10.2.254.122 – 10.2.254.123	10.2.254.123
63	10.2.254.124/31	10.2.254.124 – 10.2.254.125	10.2.254.125
64	10.2.254.126/31	10.2.254.126 – 10.2.254.127	10.2.254.127
65	10.2.254.128/31	10.2.254.128 – 10.2.254.129	10.2.254.129
66	10.2.254.130/31	10.2.254.130 – 10.2.254.131	10.2.254.131
67	10.2.254.132/31	10.2.254.132 – 10.2.254.133	10.2.254.133
68	10.2.254.134/31	10.2.254.134 – 10.2.254.135	10.2.254.135
69	10.2.254.136/31	10.2.254.136 – 10.2.254.137	10.2.254.137
70	10.2.254.138/31	10.2.254.138 – 10.2.254.139	10.2.254.139
71	10.2.254.140/31	10.2.254.140 – 10.2.254.141	10.2.254.141
72	10.2.254.142/31	10.2.254.142 – 10.2.254.143	10.2.254.143
73	10.2.254.144/31	10.2.254.144 – 10.2.254.145	10.2.254.145
74	10.2.254.146/31	10.2.254.146 – 10.2.254.147	10.2.254.147
75	10.2.254.148/31	10.2.254.148 – 10.2.254.149	10.2.254.149
76	10.2.254.150/31	10.2.254.150 – 10.2.254.151	10.2.254.151
77	10.2.254.152/31	10.2.254.152 – 10.2.254.153	10.2.254.153
78	10.2.254.154/31	10.2.254.154 – 10.2.254.155	10.2.254.155
79	10.2.254.156/31	10.2.254.156 – 10.2.254.157	10.2.254.157
80	10.2.254.158/31	10.2.254.158 – 10.2.254.159	10.2.254.159
81	10.2.254.160/31	10.2.254.160 – 10.2.254.161	10.2.254.161
82	10.2.254.162/31	10.2.254.162 – 10.2.254.163	10.2.254.163
83	10.2.254.164/31	10.2.254.164 – 10.2.254.165	10.2.254.165
84	10.2.254.166/31	10.2.254.166 – 10.2.254.167	10.2.254.167
85	10.2.254.168/31	10.2.254.168 – 10.2.254.169	10.2.254.169
86	10.2.254.170/31	10.2.254.170 – 10.2.254.171	10.2.254.171
87	10.2.254.172/31	10.2.254.172 – 10.2.254.173	10.2.254.173
88	10.2.254.174/31	10.2.254.174 – 10.2.254.175	10.2.254.175
89	10.2.254.176/31	10.2.254.176 – 10.2.254.177	10.2.254.177
90	10.2.254.178/31	10.2.254.178 – 10.2.254.179	10.2.254.179
91	10.2.254.180/31	10.2.254.180 – 10.2.254.181	10.2.254.181
92	10.2.254.182/31	10.2.254.182 – 10.2.254.183	10.2.254.183
93	10.2.254.184/31	10.2.254.184 – 10.2.254.185	10.2.254.185
94	10.2.254.186/31	10.2.254.186 – 10.2.254.187	10.2.254.187
95	10.2.254.188/31	10.2.254.188 – 10.2.254.189	10.2.254.189
96	10.2.254.190/31	10.2.254.190 – 10.2.254.191	10.2.254.191
97	10.2.254.192/31	10.2.254.192 – 10.2.254.193	10.2.254.193
98	10.2.254.194/31	10.2.254.194 – 10.2.254.195	10.2.254.195
99	10.2.254.196/31	10.2.254.196 – 10.2.254.197	10.2.254.197
100	10.2.254.198/31	10.2.254.198 – 10.2.254.199	10.2.254.199
101	10.2.254.200/31	10.2.254.200 – 10.2.254.201	10.2.254.201
102	10.2.254.202/31	10.2.254.202 – 10.2.254.203	10.2.254.203
103	10.2.254.204/31	10.2.254.204 – 10.2.254.205	10.2.254.205
104	10.2.254.206/31	10.2.254.206 – 10.2.254.207	10.2.254.207
105	10.2.254.208/31	10.2.254.208 – 10.2.254.209	10.2.254.209
106	10.2.254.210/31	10.2.254.210 – 10.2.254.211	10.2.254.211
107	10.2.254.212/31	10.2.254.212 – 10.2.254.213	10.2.254.213
108	10.2.254.214/31	10.2.254.214 – 10.2.254.215	10.2.254.215
109	10.2.254.216/31	10.2.254.216 – 10.2.254.217	10.2.254.217
110	10.2.254.218/31	10.2.254.218 – 10.2.254.219	10.2.254.219
111	10.2.254.220/31	10.2.254.220 – 10.2.254.221	10.2.254.221
112	10.2.254.222/31	10.2.254.222 – 10.2.254.223	10.2.254.223
113	10.2.254.224/31	10.2.254.224 – 10.2.254.225	10.2.254.225
114	10.2.254.226/31	10.2.254.226 – 10.2.254.227	10.2.254.227
115	10.2.254.228/31	10.2.254.228 – 10.2.254.229	10.2.254.229
116	10.2.254.230/31	10.2.254.230 – 10.2.254.231	10.2.254.231
117	10.2.254.232/31	10.2.254.232 – 10.2.254.233	10.2.254.233
118	10.2.254.234/31	10.2.254.234 – 10.2.254.235	10.2.254.235
119	10.2.254.236/31	10.2.254.236 – 10.2.254.237	10.2.254.237
120	10.2.254.238/31	10.2.254.238 – 10.2.254.239	10.2.254.239
121	10.2.254.240/31	10.2.254.240 – 10.2.254.241	10.2.254.241
122	10.2.254.242/31	10.2.254.242 – 10.2.254.243	10.2.254.243
123	10.2.254.244/31	10.2.254.244 – 10.2.254.245	10.2.254.245
124	10.2.254.246/31	10.2.254.246 – 10.2.254.247	10.2.254.247
125	10.2.254.248/31	10.2.254.248 – 10.2.254.249	10.2.254.249
126	10.2.254.250/31	10.2.254.250 – 10.2.254.251	10.2.254.251
127	10.2.254.252/31	10.2.254.252 – 10.2.254.253	10.2.254.253
128	10.2.254.254/31	10.2.254.254 – 10.2.254.255	10.2.254.255

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 →