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)10.2.129.0/24

network10.2.129.0/24

broadcast10.2.129.255

first host10.2.129.1

last host10.2.129.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.129.0/24

address00001010.00000010.10000001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10000001.00000000

broadcast00001010.00000010.10000001.11111111

green = network part, grey = host part

hex0x0a028100

decimal167936256

reverse dns0.129.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.129.0/31	10.2.129.0 – 10.2.129.1	10.2.129.1
2	10.2.129.2/31	10.2.129.2 – 10.2.129.3	10.2.129.3
3	10.2.129.4/31	10.2.129.4 – 10.2.129.5	10.2.129.5
4	10.2.129.6/31	10.2.129.6 – 10.2.129.7	10.2.129.7
5	10.2.129.8/31	10.2.129.8 – 10.2.129.9	10.2.129.9
6	10.2.129.10/31	10.2.129.10 – 10.2.129.11	10.2.129.11
7	10.2.129.12/31	10.2.129.12 – 10.2.129.13	10.2.129.13
8	10.2.129.14/31	10.2.129.14 – 10.2.129.15	10.2.129.15
9	10.2.129.16/31	10.2.129.16 – 10.2.129.17	10.2.129.17
10	10.2.129.18/31	10.2.129.18 – 10.2.129.19	10.2.129.19
11	10.2.129.20/31	10.2.129.20 – 10.2.129.21	10.2.129.21
12	10.2.129.22/31	10.2.129.22 – 10.2.129.23	10.2.129.23
13	10.2.129.24/31	10.2.129.24 – 10.2.129.25	10.2.129.25
14	10.2.129.26/31	10.2.129.26 – 10.2.129.27	10.2.129.27
15	10.2.129.28/31	10.2.129.28 – 10.2.129.29	10.2.129.29
16	10.2.129.30/31	10.2.129.30 – 10.2.129.31	10.2.129.31
17	10.2.129.32/31	10.2.129.32 – 10.2.129.33	10.2.129.33
18	10.2.129.34/31	10.2.129.34 – 10.2.129.35	10.2.129.35
19	10.2.129.36/31	10.2.129.36 – 10.2.129.37	10.2.129.37
20	10.2.129.38/31	10.2.129.38 – 10.2.129.39	10.2.129.39
21	10.2.129.40/31	10.2.129.40 – 10.2.129.41	10.2.129.41
22	10.2.129.42/31	10.2.129.42 – 10.2.129.43	10.2.129.43
23	10.2.129.44/31	10.2.129.44 – 10.2.129.45	10.2.129.45
24	10.2.129.46/31	10.2.129.46 – 10.2.129.47	10.2.129.47
25	10.2.129.48/31	10.2.129.48 – 10.2.129.49	10.2.129.49
26	10.2.129.50/31	10.2.129.50 – 10.2.129.51	10.2.129.51
27	10.2.129.52/31	10.2.129.52 – 10.2.129.53	10.2.129.53
28	10.2.129.54/31	10.2.129.54 – 10.2.129.55	10.2.129.55
29	10.2.129.56/31	10.2.129.56 – 10.2.129.57	10.2.129.57
30	10.2.129.58/31	10.2.129.58 – 10.2.129.59	10.2.129.59
31	10.2.129.60/31	10.2.129.60 – 10.2.129.61	10.2.129.61
32	10.2.129.62/31	10.2.129.62 – 10.2.129.63	10.2.129.63
33	10.2.129.64/31	10.2.129.64 – 10.2.129.65	10.2.129.65
34	10.2.129.66/31	10.2.129.66 – 10.2.129.67	10.2.129.67
35	10.2.129.68/31	10.2.129.68 – 10.2.129.69	10.2.129.69
36	10.2.129.70/31	10.2.129.70 – 10.2.129.71	10.2.129.71
37	10.2.129.72/31	10.2.129.72 – 10.2.129.73	10.2.129.73
38	10.2.129.74/31	10.2.129.74 – 10.2.129.75	10.2.129.75
39	10.2.129.76/31	10.2.129.76 – 10.2.129.77	10.2.129.77
40	10.2.129.78/31	10.2.129.78 – 10.2.129.79	10.2.129.79
41	10.2.129.80/31	10.2.129.80 – 10.2.129.81	10.2.129.81
42	10.2.129.82/31	10.2.129.82 – 10.2.129.83	10.2.129.83
43	10.2.129.84/31	10.2.129.84 – 10.2.129.85	10.2.129.85
44	10.2.129.86/31	10.2.129.86 – 10.2.129.87	10.2.129.87
45	10.2.129.88/31	10.2.129.88 – 10.2.129.89	10.2.129.89
46	10.2.129.90/31	10.2.129.90 – 10.2.129.91	10.2.129.91
47	10.2.129.92/31	10.2.129.92 – 10.2.129.93	10.2.129.93
48	10.2.129.94/31	10.2.129.94 – 10.2.129.95	10.2.129.95
49	10.2.129.96/31	10.2.129.96 – 10.2.129.97	10.2.129.97
50	10.2.129.98/31	10.2.129.98 – 10.2.129.99	10.2.129.99
51	10.2.129.100/31	10.2.129.100 – 10.2.129.101	10.2.129.101
52	10.2.129.102/31	10.2.129.102 – 10.2.129.103	10.2.129.103
53	10.2.129.104/31	10.2.129.104 – 10.2.129.105	10.2.129.105
54	10.2.129.106/31	10.2.129.106 – 10.2.129.107	10.2.129.107
55	10.2.129.108/31	10.2.129.108 – 10.2.129.109	10.2.129.109
56	10.2.129.110/31	10.2.129.110 – 10.2.129.111	10.2.129.111
57	10.2.129.112/31	10.2.129.112 – 10.2.129.113	10.2.129.113
58	10.2.129.114/31	10.2.129.114 – 10.2.129.115	10.2.129.115
59	10.2.129.116/31	10.2.129.116 – 10.2.129.117	10.2.129.117
60	10.2.129.118/31	10.2.129.118 – 10.2.129.119	10.2.129.119
61	10.2.129.120/31	10.2.129.120 – 10.2.129.121	10.2.129.121
62	10.2.129.122/31	10.2.129.122 – 10.2.129.123	10.2.129.123
63	10.2.129.124/31	10.2.129.124 – 10.2.129.125	10.2.129.125
64	10.2.129.126/31	10.2.129.126 – 10.2.129.127	10.2.129.127
65	10.2.129.128/31	10.2.129.128 – 10.2.129.129	10.2.129.129
66	10.2.129.130/31	10.2.129.130 – 10.2.129.131	10.2.129.131
67	10.2.129.132/31	10.2.129.132 – 10.2.129.133	10.2.129.133
68	10.2.129.134/31	10.2.129.134 – 10.2.129.135	10.2.129.135
69	10.2.129.136/31	10.2.129.136 – 10.2.129.137	10.2.129.137
70	10.2.129.138/31	10.2.129.138 – 10.2.129.139	10.2.129.139
71	10.2.129.140/31	10.2.129.140 – 10.2.129.141	10.2.129.141
72	10.2.129.142/31	10.2.129.142 – 10.2.129.143	10.2.129.143
73	10.2.129.144/31	10.2.129.144 – 10.2.129.145	10.2.129.145
74	10.2.129.146/31	10.2.129.146 – 10.2.129.147	10.2.129.147
75	10.2.129.148/31	10.2.129.148 – 10.2.129.149	10.2.129.149
76	10.2.129.150/31	10.2.129.150 – 10.2.129.151	10.2.129.151
77	10.2.129.152/31	10.2.129.152 – 10.2.129.153	10.2.129.153
78	10.2.129.154/31	10.2.129.154 – 10.2.129.155	10.2.129.155
79	10.2.129.156/31	10.2.129.156 – 10.2.129.157	10.2.129.157
80	10.2.129.158/31	10.2.129.158 – 10.2.129.159	10.2.129.159
81	10.2.129.160/31	10.2.129.160 – 10.2.129.161	10.2.129.161
82	10.2.129.162/31	10.2.129.162 – 10.2.129.163	10.2.129.163
83	10.2.129.164/31	10.2.129.164 – 10.2.129.165	10.2.129.165
84	10.2.129.166/31	10.2.129.166 – 10.2.129.167	10.2.129.167
85	10.2.129.168/31	10.2.129.168 – 10.2.129.169	10.2.129.169
86	10.2.129.170/31	10.2.129.170 – 10.2.129.171	10.2.129.171
87	10.2.129.172/31	10.2.129.172 – 10.2.129.173	10.2.129.173
88	10.2.129.174/31	10.2.129.174 – 10.2.129.175	10.2.129.175
89	10.2.129.176/31	10.2.129.176 – 10.2.129.177	10.2.129.177
90	10.2.129.178/31	10.2.129.178 – 10.2.129.179	10.2.129.179
91	10.2.129.180/31	10.2.129.180 – 10.2.129.181	10.2.129.181
92	10.2.129.182/31	10.2.129.182 – 10.2.129.183	10.2.129.183
93	10.2.129.184/31	10.2.129.184 – 10.2.129.185	10.2.129.185
94	10.2.129.186/31	10.2.129.186 – 10.2.129.187	10.2.129.187
95	10.2.129.188/31	10.2.129.188 – 10.2.129.189	10.2.129.189
96	10.2.129.190/31	10.2.129.190 – 10.2.129.191	10.2.129.191
97	10.2.129.192/31	10.2.129.192 – 10.2.129.193	10.2.129.193
98	10.2.129.194/31	10.2.129.194 – 10.2.129.195	10.2.129.195
99	10.2.129.196/31	10.2.129.196 – 10.2.129.197	10.2.129.197
100	10.2.129.198/31	10.2.129.198 – 10.2.129.199	10.2.129.199
101	10.2.129.200/31	10.2.129.200 – 10.2.129.201	10.2.129.201
102	10.2.129.202/31	10.2.129.202 – 10.2.129.203	10.2.129.203
103	10.2.129.204/31	10.2.129.204 – 10.2.129.205	10.2.129.205
104	10.2.129.206/31	10.2.129.206 – 10.2.129.207	10.2.129.207
105	10.2.129.208/31	10.2.129.208 – 10.2.129.209	10.2.129.209
106	10.2.129.210/31	10.2.129.210 – 10.2.129.211	10.2.129.211
107	10.2.129.212/31	10.2.129.212 – 10.2.129.213	10.2.129.213
108	10.2.129.214/31	10.2.129.214 – 10.2.129.215	10.2.129.215
109	10.2.129.216/31	10.2.129.216 – 10.2.129.217	10.2.129.217
110	10.2.129.218/31	10.2.129.218 – 10.2.129.219	10.2.129.219
111	10.2.129.220/31	10.2.129.220 – 10.2.129.221	10.2.129.221
112	10.2.129.222/31	10.2.129.222 – 10.2.129.223	10.2.129.223
113	10.2.129.224/31	10.2.129.224 – 10.2.129.225	10.2.129.225
114	10.2.129.226/31	10.2.129.226 – 10.2.129.227	10.2.129.227
115	10.2.129.228/31	10.2.129.228 – 10.2.129.229	10.2.129.229
116	10.2.129.230/31	10.2.129.230 – 10.2.129.231	10.2.129.231
117	10.2.129.232/31	10.2.129.232 – 10.2.129.233	10.2.129.233
118	10.2.129.234/31	10.2.129.234 – 10.2.129.235	10.2.129.235
119	10.2.129.236/31	10.2.129.236 – 10.2.129.237	10.2.129.237
120	10.2.129.238/31	10.2.129.238 – 10.2.129.239	10.2.129.239
121	10.2.129.240/31	10.2.129.240 – 10.2.129.241	10.2.129.241
122	10.2.129.242/31	10.2.129.242 – 10.2.129.243	10.2.129.243
123	10.2.129.244/31	10.2.129.244 – 10.2.129.245	10.2.129.245
124	10.2.129.246/31	10.2.129.246 – 10.2.129.247	10.2.129.247
125	10.2.129.248/31	10.2.129.248 – 10.2.129.249	10.2.129.249
126	10.2.129.250/31	10.2.129.250 – 10.2.129.251	10.2.129.251
127	10.2.129.252/31	10.2.129.252 – 10.2.129.253	10.2.129.253
128	10.2.129.254/31	10.2.129.254 – 10.2.129.255	10.2.129.255

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 →