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)10.2.134.0/23

network10.2.134.0/23

broadcast10.2.135.255

first host10.2.134.1

last host10.2.135.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.134.0/23

address00001010.00000010.10000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10000110.00000000

broadcast00001010.00000010.10000111.11111111

green = network part, grey = host part

hex0x0a028600

decimal167937536

reverse dns0.134.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.134.0/30	10.2.134.1 – 10.2.134.2	10.2.134.3
2	10.2.134.4/30	10.2.134.5 – 10.2.134.6	10.2.134.7
3	10.2.134.8/30	10.2.134.9 – 10.2.134.10	10.2.134.11
4	10.2.134.12/30	10.2.134.13 – 10.2.134.14	10.2.134.15
5	10.2.134.16/30	10.2.134.17 – 10.2.134.18	10.2.134.19
6	10.2.134.20/30	10.2.134.21 – 10.2.134.22	10.2.134.23
7	10.2.134.24/30	10.2.134.25 – 10.2.134.26	10.2.134.27
8	10.2.134.28/30	10.2.134.29 – 10.2.134.30	10.2.134.31
9	10.2.134.32/30	10.2.134.33 – 10.2.134.34	10.2.134.35
10	10.2.134.36/30	10.2.134.37 – 10.2.134.38	10.2.134.39
11	10.2.134.40/30	10.2.134.41 – 10.2.134.42	10.2.134.43
12	10.2.134.44/30	10.2.134.45 – 10.2.134.46	10.2.134.47
13	10.2.134.48/30	10.2.134.49 – 10.2.134.50	10.2.134.51
14	10.2.134.52/30	10.2.134.53 – 10.2.134.54	10.2.134.55
15	10.2.134.56/30	10.2.134.57 – 10.2.134.58	10.2.134.59
16	10.2.134.60/30	10.2.134.61 – 10.2.134.62	10.2.134.63
17	10.2.134.64/30	10.2.134.65 – 10.2.134.66	10.2.134.67
18	10.2.134.68/30	10.2.134.69 – 10.2.134.70	10.2.134.71
19	10.2.134.72/30	10.2.134.73 – 10.2.134.74	10.2.134.75
20	10.2.134.76/30	10.2.134.77 – 10.2.134.78	10.2.134.79
21	10.2.134.80/30	10.2.134.81 – 10.2.134.82	10.2.134.83
22	10.2.134.84/30	10.2.134.85 – 10.2.134.86	10.2.134.87
23	10.2.134.88/30	10.2.134.89 – 10.2.134.90	10.2.134.91
24	10.2.134.92/30	10.2.134.93 – 10.2.134.94	10.2.134.95
25	10.2.134.96/30	10.2.134.97 – 10.2.134.98	10.2.134.99
26	10.2.134.100/30	10.2.134.101 – 10.2.134.102	10.2.134.103
27	10.2.134.104/30	10.2.134.105 – 10.2.134.106	10.2.134.107
28	10.2.134.108/30	10.2.134.109 – 10.2.134.110	10.2.134.111
29	10.2.134.112/30	10.2.134.113 – 10.2.134.114	10.2.134.115
30	10.2.134.116/30	10.2.134.117 – 10.2.134.118	10.2.134.119
31	10.2.134.120/30	10.2.134.121 – 10.2.134.122	10.2.134.123
32	10.2.134.124/30	10.2.134.125 – 10.2.134.126	10.2.134.127
33	10.2.134.128/30	10.2.134.129 – 10.2.134.130	10.2.134.131
34	10.2.134.132/30	10.2.134.133 – 10.2.134.134	10.2.134.135
35	10.2.134.136/30	10.2.134.137 – 10.2.134.138	10.2.134.139
36	10.2.134.140/30	10.2.134.141 – 10.2.134.142	10.2.134.143
37	10.2.134.144/30	10.2.134.145 – 10.2.134.146	10.2.134.147
38	10.2.134.148/30	10.2.134.149 – 10.2.134.150	10.2.134.151
39	10.2.134.152/30	10.2.134.153 – 10.2.134.154	10.2.134.155
40	10.2.134.156/30	10.2.134.157 – 10.2.134.158	10.2.134.159
41	10.2.134.160/30	10.2.134.161 – 10.2.134.162	10.2.134.163
42	10.2.134.164/30	10.2.134.165 – 10.2.134.166	10.2.134.167
43	10.2.134.168/30	10.2.134.169 – 10.2.134.170	10.2.134.171
44	10.2.134.172/30	10.2.134.173 – 10.2.134.174	10.2.134.175
45	10.2.134.176/30	10.2.134.177 – 10.2.134.178	10.2.134.179
46	10.2.134.180/30	10.2.134.181 – 10.2.134.182	10.2.134.183
47	10.2.134.184/30	10.2.134.185 – 10.2.134.186	10.2.134.187
48	10.2.134.188/30	10.2.134.189 – 10.2.134.190	10.2.134.191
49	10.2.134.192/30	10.2.134.193 – 10.2.134.194	10.2.134.195
50	10.2.134.196/30	10.2.134.197 – 10.2.134.198	10.2.134.199
51	10.2.134.200/30	10.2.134.201 – 10.2.134.202	10.2.134.203
52	10.2.134.204/30	10.2.134.205 – 10.2.134.206	10.2.134.207
53	10.2.134.208/30	10.2.134.209 – 10.2.134.210	10.2.134.211
54	10.2.134.212/30	10.2.134.213 – 10.2.134.214	10.2.134.215
55	10.2.134.216/30	10.2.134.217 – 10.2.134.218	10.2.134.219
56	10.2.134.220/30	10.2.134.221 – 10.2.134.222	10.2.134.223
57	10.2.134.224/30	10.2.134.225 – 10.2.134.226	10.2.134.227
58	10.2.134.228/30	10.2.134.229 – 10.2.134.230	10.2.134.231
59	10.2.134.232/30	10.2.134.233 – 10.2.134.234	10.2.134.235
60	10.2.134.236/30	10.2.134.237 – 10.2.134.238	10.2.134.239
61	10.2.134.240/30	10.2.134.241 – 10.2.134.242	10.2.134.243
62	10.2.134.244/30	10.2.134.245 – 10.2.134.246	10.2.134.247
63	10.2.134.248/30	10.2.134.249 – 10.2.134.250	10.2.134.251
64	10.2.134.252/30	10.2.134.253 – 10.2.134.254	10.2.134.255
65	10.2.135.0/30	10.2.135.1 – 10.2.135.2	10.2.135.3
66	10.2.135.4/30	10.2.135.5 – 10.2.135.6	10.2.135.7
67	10.2.135.8/30	10.2.135.9 – 10.2.135.10	10.2.135.11
68	10.2.135.12/30	10.2.135.13 – 10.2.135.14	10.2.135.15
69	10.2.135.16/30	10.2.135.17 – 10.2.135.18	10.2.135.19
70	10.2.135.20/30	10.2.135.21 – 10.2.135.22	10.2.135.23
71	10.2.135.24/30	10.2.135.25 – 10.2.135.26	10.2.135.27
72	10.2.135.28/30	10.2.135.29 – 10.2.135.30	10.2.135.31
73	10.2.135.32/30	10.2.135.33 – 10.2.135.34	10.2.135.35
74	10.2.135.36/30	10.2.135.37 – 10.2.135.38	10.2.135.39
75	10.2.135.40/30	10.2.135.41 – 10.2.135.42	10.2.135.43
76	10.2.135.44/30	10.2.135.45 – 10.2.135.46	10.2.135.47
77	10.2.135.48/30	10.2.135.49 – 10.2.135.50	10.2.135.51
78	10.2.135.52/30	10.2.135.53 – 10.2.135.54	10.2.135.55
79	10.2.135.56/30	10.2.135.57 – 10.2.135.58	10.2.135.59
80	10.2.135.60/30	10.2.135.61 – 10.2.135.62	10.2.135.63
81	10.2.135.64/30	10.2.135.65 – 10.2.135.66	10.2.135.67
82	10.2.135.68/30	10.2.135.69 – 10.2.135.70	10.2.135.71
83	10.2.135.72/30	10.2.135.73 – 10.2.135.74	10.2.135.75
84	10.2.135.76/30	10.2.135.77 – 10.2.135.78	10.2.135.79
85	10.2.135.80/30	10.2.135.81 – 10.2.135.82	10.2.135.83
86	10.2.135.84/30	10.2.135.85 – 10.2.135.86	10.2.135.87
87	10.2.135.88/30	10.2.135.89 – 10.2.135.90	10.2.135.91
88	10.2.135.92/30	10.2.135.93 – 10.2.135.94	10.2.135.95
89	10.2.135.96/30	10.2.135.97 – 10.2.135.98	10.2.135.99
90	10.2.135.100/30	10.2.135.101 – 10.2.135.102	10.2.135.103
91	10.2.135.104/30	10.2.135.105 – 10.2.135.106	10.2.135.107
92	10.2.135.108/30	10.2.135.109 – 10.2.135.110	10.2.135.111
93	10.2.135.112/30	10.2.135.113 – 10.2.135.114	10.2.135.115
94	10.2.135.116/30	10.2.135.117 – 10.2.135.118	10.2.135.119
95	10.2.135.120/30	10.2.135.121 – 10.2.135.122	10.2.135.123
96	10.2.135.124/30	10.2.135.125 – 10.2.135.126	10.2.135.127
97	10.2.135.128/30	10.2.135.129 – 10.2.135.130	10.2.135.131
98	10.2.135.132/30	10.2.135.133 – 10.2.135.134	10.2.135.135
99	10.2.135.136/30	10.2.135.137 – 10.2.135.138	10.2.135.139
100	10.2.135.140/30	10.2.135.141 – 10.2.135.142	10.2.135.143
101	10.2.135.144/30	10.2.135.145 – 10.2.135.146	10.2.135.147
102	10.2.135.148/30	10.2.135.149 – 10.2.135.150	10.2.135.151
103	10.2.135.152/30	10.2.135.153 – 10.2.135.154	10.2.135.155
104	10.2.135.156/30	10.2.135.157 – 10.2.135.158	10.2.135.159
105	10.2.135.160/30	10.2.135.161 – 10.2.135.162	10.2.135.163
106	10.2.135.164/30	10.2.135.165 – 10.2.135.166	10.2.135.167
107	10.2.135.168/30	10.2.135.169 – 10.2.135.170	10.2.135.171
108	10.2.135.172/30	10.2.135.173 – 10.2.135.174	10.2.135.175
109	10.2.135.176/30	10.2.135.177 – 10.2.135.178	10.2.135.179
110	10.2.135.180/30	10.2.135.181 – 10.2.135.182	10.2.135.183
111	10.2.135.184/30	10.2.135.185 – 10.2.135.186	10.2.135.187
112	10.2.135.188/30	10.2.135.189 – 10.2.135.190	10.2.135.191
113	10.2.135.192/30	10.2.135.193 – 10.2.135.194	10.2.135.195
114	10.2.135.196/30	10.2.135.197 – 10.2.135.198	10.2.135.199
115	10.2.135.200/30	10.2.135.201 – 10.2.135.202	10.2.135.203
116	10.2.135.204/30	10.2.135.205 – 10.2.135.206	10.2.135.207
117	10.2.135.208/30	10.2.135.209 – 10.2.135.210	10.2.135.211
118	10.2.135.212/30	10.2.135.213 – 10.2.135.214	10.2.135.215
119	10.2.135.216/30	10.2.135.217 – 10.2.135.218	10.2.135.219
120	10.2.135.220/30	10.2.135.221 – 10.2.135.222	10.2.135.223
121	10.2.135.224/30	10.2.135.225 – 10.2.135.226	10.2.135.227
122	10.2.135.228/30	10.2.135.229 – 10.2.135.230	10.2.135.231
123	10.2.135.232/30	10.2.135.233 – 10.2.135.234	10.2.135.235
124	10.2.135.236/30	10.2.135.237 – 10.2.135.238	10.2.135.239
125	10.2.135.240/30	10.2.135.241 – 10.2.135.242	10.2.135.243
126	10.2.135.244/30	10.2.135.245 – 10.2.135.246	10.2.135.247
127	10.2.135.248/30	10.2.135.249 – 10.2.135.250	10.2.135.251
128	10.2.135.252/30	10.2.135.253 – 10.2.135.254	10.2.135.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →