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)10.2.34.0/23

network10.2.34.0/23

broadcast10.2.35.255

first host10.2.34.1

last host10.2.35.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.34.0/23

address00001010.00000010.00100010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.00100010.00000000

broadcast00001010.00000010.00100011.11111111

green = network part, grey = host part

hex0x0a022200

decimal167911936

reverse dns0.34.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2200

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.34.0/30	10.2.34.1 – 10.2.34.2	10.2.34.3
2	10.2.34.4/30	10.2.34.5 – 10.2.34.6	10.2.34.7
3	10.2.34.8/30	10.2.34.9 – 10.2.34.10	10.2.34.11
4	10.2.34.12/30	10.2.34.13 – 10.2.34.14	10.2.34.15
5	10.2.34.16/30	10.2.34.17 – 10.2.34.18	10.2.34.19
6	10.2.34.20/30	10.2.34.21 – 10.2.34.22	10.2.34.23
7	10.2.34.24/30	10.2.34.25 – 10.2.34.26	10.2.34.27
8	10.2.34.28/30	10.2.34.29 – 10.2.34.30	10.2.34.31
9	10.2.34.32/30	10.2.34.33 – 10.2.34.34	10.2.34.35
10	10.2.34.36/30	10.2.34.37 – 10.2.34.38	10.2.34.39
11	10.2.34.40/30	10.2.34.41 – 10.2.34.42	10.2.34.43
12	10.2.34.44/30	10.2.34.45 – 10.2.34.46	10.2.34.47
13	10.2.34.48/30	10.2.34.49 – 10.2.34.50	10.2.34.51
14	10.2.34.52/30	10.2.34.53 – 10.2.34.54	10.2.34.55
15	10.2.34.56/30	10.2.34.57 – 10.2.34.58	10.2.34.59
16	10.2.34.60/30	10.2.34.61 – 10.2.34.62	10.2.34.63
17	10.2.34.64/30	10.2.34.65 – 10.2.34.66	10.2.34.67
18	10.2.34.68/30	10.2.34.69 – 10.2.34.70	10.2.34.71
19	10.2.34.72/30	10.2.34.73 – 10.2.34.74	10.2.34.75
20	10.2.34.76/30	10.2.34.77 – 10.2.34.78	10.2.34.79
21	10.2.34.80/30	10.2.34.81 – 10.2.34.82	10.2.34.83
22	10.2.34.84/30	10.2.34.85 – 10.2.34.86	10.2.34.87
23	10.2.34.88/30	10.2.34.89 – 10.2.34.90	10.2.34.91
24	10.2.34.92/30	10.2.34.93 – 10.2.34.94	10.2.34.95
25	10.2.34.96/30	10.2.34.97 – 10.2.34.98	10.2.34.99
26	10.2.34.100/30	10.2.34.101 – 10.2.34.102	10.2.34.103
27	10.2.34.104/30	10.2.34.105 – 10.2.34.106	10.2.34.107
28	10.2.34.108/30	10.2.34.109 – 10.2.34.110	10.2.34.111
29	10.2.34.112/30	10.2.34.113 – 10.2.34.114	10.2.34.115
30	10.2.34.116/30	10.2.34.117 – 10.2.34.118	10.2.34.119
31	10.2.34.120/30	10.2.34.121 – 10.2.34.122	10.2.34.123
32	10.2.34.124/30	10.2.34.125 – 10.2.34.126	10.2.34.127
33	10.2.34.128/30	10.2.34.129 – 10.2.34.130	10.2.34.131
34	10.2.34.132/30	10.2.34.133 – 10.2.34.134	10.2.34.135
35	10.2.34.136/30	10.2.34.137 – 10.2.34.138	10.2.34.139
36	10.2.34.140/30	10.2.34.141 – 10.2.34.142	10.2.34.143
37	10.2.34.144/30	10.2.34.145 – 10.2.34.146	10.2.34.147
38	10.2.34.148/30	10.2.34.149 – 10.2.34.150	10.2.34.151
39	10.2.34.152/30	10.2.34.153 – 10.2.34.154	10.2.34.155
40	10.2.34.156/30	10.2.34.157 – 10.2.34.158	10.2.34.159
41	10.2.34.160/30	10.2.34.161 – 10.2.34.162	10.2.34.163
42	10.2.34.164/30	10.2.34.165 – 10.2.34.166	10.2.34.167
43	10.2.34.168/30	10.2.34.169 – 10.2.34.170	10.2.34.171
44	10.2.34.172/30	10.2.34.173 – 10.2.34.174	10.2.34.175
45	10.2.34.176/30	10.2.34.177 – 10.2.34.178	10.2.34.179
46	10.2.34.180/30	10.2.34.181 – 10.2.34.182	10.2.34.183
47	10.2.34.184/30	10.2.34.185 – 10.2.34.186	10.2.34.187
48	10.2.34.188/30	10.2.34.189 – 10.2.34.190	10.2.34.191
49	10.2.34.192/30	10.2.34.193 – 10.2.34.194	10.2.34.195
50	10.2.34.196/30	10.2.34.197 – 10.2.34.198	10.2.34.199
51	10.2.34.200/30	10.2.34.201 – 10.2.34.202	10.2.34.203
52	10.2.34.204/30	10.2.34.205 – 10.2.34.206	10.2.34.207
53	10.2.34.208/30	10.2.34.209 – 10.2.34.210	10.2.34.211
54	10.2.34.212/30	10.2.34.213 – 10.2.34.214	10.2.34.215
55	10.2.34.216/30	10.2.34.217 – 10.2.34.218	10.2.34.219
56	10.2.34.220/30	10.2.34.221 – 10.2.34.222	10.2.34.223
57	10.2.34.224/30	10.2.34.225 – 10.2.34.226	10.2.34.227
58	10.2.34.228/30	10.2.34.229 – 10.2.34.230	10.2.34.231
59	10.2.34.232/30	10.2.34.233 – 10.2.34.234	10.2.34.235
60	10.2.34.236/30	10.2.34.237 – 10.2.34.238	10.2.34.239
61	10.2.34.240/30	10.2.34.241 – 10.2.34.242	10.2.34.243
62	10.2.34.244/30	10.2.34.245 – 10.2.34.246	10.2.34.247
63	10.2.34.248/30	10.2.34.249 – 10.2.34.250	10.2.34.251
64	10.2.34.252/30	10.2.34.253 – 10.2.34.254	10.2.34.255
65	10.2.35.0/30	10.2.35.1 – 10.2.35.2	10.2.35.3
66	10.2.35.4/30	10.2.35.5 – 10.2.35.6	10.2.35.7
67	10.2.35.8/30	10.2.35.9 – 10.2.35.10	10.2.35.11
68	10.2.35.12/30	10.2.35.13 – 10.2.35.14	10.2.35.15
69	10.2.35.16/30	10.2.35.17 – 10.2.35.18	10.2.35.19
70	10.2.35.20/30	10.2.35.21 – 10.2.35.22	10.2.35.23
71	10.2.35.24/30	10.2.35.25 – 10.2.35.26	10.2.35.27
72	10.2.35.28/30	10.2.35.29 – 10.2.35.30	10.2.35.31
73	10.2.35.32/30	10.2.35.33 – 10.2.35.34	10.2.35.35
74	10.2.35.36/30	10.2.35.37 – 10.2.35.38	10.2.35.39
75	10.2.35.40/30	10.2.35.41 – 10.2.35.42	10.2.35.43
76	10.2.35.44/30	10.2.35.45 – 10.2.35.46	10.2.35.47
77	10.2.35.48/30	10.2.35.49 – 10.2.35.50	10.2.35.51
78	10.2.35.52/30	10.2.35.53 – 10.2.35.54	10.2.35.55
79	10.2.35.56/30	10.2.35.57 – 10.2.35.58	10.2.35.59
80	10.2.35.60/30	10.2.35.61 – 10.2.35.62	10.2.35.63
81	10.2.35.64/30	10.2.35.65 – 10.2.35.66	10.2.35.67
82	10.2.35.68/30	10.2.35.69 – 10.2.35.70	10.2.35.71
83	10.2.35.72/30	10.2.35.73 – 10.2.35.74	10.2.35.75
84	10.2.35.76/30	10.2.35.77 – 10.2.35.78	10.2.35.79
85	10.2.35.80/30	10.2.35.81 – 10.2.35.82	10.2.35.83
86	10.2.35.84/30	10.2.35.85 – 10.2.35.86	10.2.35.87
87	10.2.35.88/30	10.2.35.89 – 10.2.35.90	10.2.35.91
88	10.2.35.92/30	10.2.35.93 – 10.2.35.94	10.2.35.95
89	10.2.35.96/30	10.2.35.97 – 10.2.35.98	10.2.35.99
90	10.2.35.100/30	10.2.35.101 – 10.2.35.102	10.2.35.103
91	10.2.35.104/30	10.2.35.105 – 10.2.35.106	10.2.35.107
92	10.2.35.108/30	10.2.35.109 – 10.2.35.110	10.2.35.111
93	10.2.35.112/30	10.2.35.113 – 10.2.35.114	10.2.35.115
94	10.2.35.116/30	10.2.35.117 – 10.2.35.118	10.2.35.119
95	10.2.35.120/30	10.2.35.121 – 10.2.35.122	10.2.35.123
96	10.2.35.124/30	10.2.35.125 – 10.2.35.126	10.2.35.127
97	10.2.35.128/30	10.2.35.129 – 10.2.35.130	10.2.35.131
98	10.2.35.132/30	10.2.35.133 – 10.2.35.134	10.2.35.135
99	10.2.35.136/30	10.2.35.137 – 10.2.35.138	10.2.35.139
100	10.2.35.140/30	10.2.35.141 – 10.2.35.142	10.2.35.143
101	10.2.35.144/30	10.2.35.145 – 10.2.35.146	10.2.35.147
102	10.2.35.148/30	10.2.35.149 – 10.2.35.150	10.2.35.151
103	10.2.35.152/30	10.2.35.153 – 10.2.35.154	10.2.35.155
104	10.2.35.156/30	10.2.35.157 – 10.2.35.158	10.2.35.159
105	10.2.35.160/30	10.2.35.161 – 10.2.35.162	10.2.35.163
106	10.2.35.164/30	10.2.35.165 – 10.2.35.166	10.2.35.167
107	10.2.35.168/30	10.2.35.169 – 10.2.35.170	10.2.35.171
108	10.2.35.172/30	10.2.35.173 – 10.2.35.174	10.2.35.175
109	10.2.35.176/30	10.2.35.177 – 10.2.35.178	10.2.35.179
110	10.2.35.180/30	10.2.35.181 – 10.2.35.182	10.2.35.183
111	10.2.35.184/30	10.2.35.185 – 10.2.35.186	10.2.35.187
112	10.2.35.188/30	10.2.35.189 – 10.2.35.190	10.2.35.191
113	10.2.35.192/30	10.2.35.193 – 10.2.35.194	10.2.35.195
114	10.2.35.196/30	10.2.35.197 – 10.2.35.198	10.2.35.199
115	10.2.35.200/30	10.2.35.201 – 10.2.35.202	10.2.35.203
116	10.2.35.204/30	10.2.35.205 – 10.2.35.206	10.2.35.207
117	10.2.35.208/30	10.2.35.209 – 10.2.35.210	10.2.35.211
118	10.2.35.212/30	10.2.35.213 – 10.2.35.214	10.2.35.215
119	10.2.35.216/30	10.2.35.217 – 10.2.35.218	10.2.35.219
120	10.2.35.220/30	10.2.35.221 – 10.2.35.222	10.2.35.223
121	10.2.35.224/30	10.2.35.225 – 10.2.35.226	10.2.35.227
122	10.2.35.228/30	10.2.35.229 – 10.2.35.230	10.2.35.231
123	10.2.35.232/30	10.2.35.233 – 10.2.35.234	10.2.35.235
124	10.2.35.236/30	10.2.35.237 – 10.2.35.238	10.2.35.239
125	10.2.35.240/30	10.2.35.241 – 10.2.35.242	10.2.35.243
126	10.2.35.244/30	10.2.35.245 – 10.2.35.246	10.2.35.247
127	10.2.35.248/30	10.2.35.249 – 10.2.35.250	10.2.35.251
128	10.2.35.252/30	10.2.35.253 – 10.2.35.254	10.2.35.255

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 →