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)10.76.170.0/23

network10.76.170.0/23

broadcast10.76.171.255

first host10.76.170.1

last host10.76.171.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.76.170.0/23

address00001010.01001100.10101010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001100.10101010.00000000

broadcast00001010.01001100.10101011.11111111

green = network part, grey = host part

hex0x0a4caa00

decimal172796416

reverse dns0.170.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:aa00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.170.0/30	10.76.170.1 – 10.76.170.2	10.76.170.3
2	10.76.170.4/30	10.76.170.5 – 10.76.170.6	10.76.170.7
3	10.76.170.8/30	10.76.170.9 – 10.76.170.10	10.76.170.11
4	10.76.170.12/30	10.76.170.13 – 10.76.170.14	10.76.170.15
5	10.76.170.16/30	10.76.170.17 – 10.76.170.18	10.76.170.19
6	10.76.170.20/30	10.76.170.21 – 10.76.170.22	10.76.170.23
7	10.76.170.24/30	10.76.170.25 – 10.76.170.26	10.76.170.27
8	10.76.170.28/30	10.76.170.29 – 10.76.170.30	10.76.170.31
9	10.76.170.32/30	10.76.170.33 – 10.76.170.34	10.76.170.35
10	10.76.170.36/30	10.76.170.37 – 10.76.170.38	10.76.170.39
11	10.76.170.40/30	10.76.170.41 – 10.76.170.42	10.76.170.43
12	10.76.170.44/30	10.76.170.45 – 10.76.170.46	10.76.170.47
13	10.76.170.48/30	10.76.170.49 – 10.76.170.50	10.76.170.51
14	10.76.170.52/30	10.76.170.53 – 10.76.170.54	10.76.170.55
15	10.76.170.56/30	10.76.170.57 – 10.76.170.58	10.76.170.59
16	10.76.170.60/30	10.76.170.61 – 10.76.170.62	10.76.170.63
17	10.76.170.64/30	10.76.170.65 – 10.76.170.66	10.76.170.67
18	10.76.170.68/30	10.76.170.69 – 10.76.170.70	10.76.170.71
19	10.76.170.72/30	10.76.170.73 – 10.76.170.74	10.76.170.75
20	10.76.170.76/30	10.76.170.77 – 10.76.170.78	10.76.170.79
21	10.76.170.80/30	10.76.170.81 – 10.76.170.82	10.76.170.83
22	10.76.170.84/30	10.76.170.85 – 10.76.170.86	10.76.170.87
23	10.76.170.88/30	10.76.170.89 – 10.76.170.90	10.76.170.91
24	10.76.170.92/30	10.76.170.93 – 10.76.170.94	10.76.170.95
25	10.76.170.96/30	10.76.170.97 – 10.76.170.98	10.76.170.99
26	10.76.170.100/30	10.76.170.101 – 10.76.170.102	10.76.170.103
27	10.76.170.104/30	10.76.170.105 – 10.76.170.106	10.76.170.107
28	10.76.170.108/30	10.76.170.109 – 10.76.170.110	10.76.170.111
29	10.76.170.112/30	10.76.170.113 – 10.76.170.114	10.76.170.115
30	10.76.170.116/30	10.76.170.117 – 10.76.170.118	10.76.170.119
31	10.76.170.120/30	10.76.170.121 – 10.76.170.122	10.76.170.123
32	10.76.170.124/30	10.76.170.125 – 10.76.170.126	10.76.170.127
33	10.76.170.128/30	10.76.170.129 – 10.76.170.130	10.76.170.131
34	10.76.170.132/30	10.76.170.133 – 10.76.170.134	10.76.170.135
35	10.76.170.136/30	10.76.170.137 – 10.76.170.138	10.76.170.139
36	10.76.170.140/30	10.76.170.141 – 10.76.170.142	10.76.170.143
37	10.76.170.144/30	10.76.170.145 – 10.76.170.146	10.76.170.147
38	10.76.170.148/30	10.76.170.149 – 10.76.170.150	10.76.170.151
39	10.76.170.152/30	10.76.170.153 – 10.76.170.154	10.76.170.155
40	10.76.170.156/30	10.76.170.157 – 10.76.170.158	10.76.170.159
41	10.76.170.160/30	10.76.170.161 – 10.76.170.162	10.76.170.163
42	10.76.170.164/30	10.76.170.165 – 10.76.170.166	10.76.170.167
43	10.76.170.168/30	10.76.170.169 – 10.76.170.170	10.76.170.171
44	10.76.170.172/30	10.76.170.173 – 10.76.170.174	10.76.170.175
45	10.76.170.176/30	10.76.170.177 – 10.76.170.178	10.76.170.179
46	10.76.170.180/30	10.76.170.181 – 10.76.170.182	10.76.170.183
47	10.76.170.184/30	10.76.170.185 – 10.76.170.186	10.76.170.187
48	10.76.170.188/30	10.76.170.189 – 10.76.170.190	10.76.170.191
49	10.76.170.192/30	10.76.170.193 – 10.76.170.194	10.76.170.195
50	10.76.170.196/30	10.76.170.197 – 10.76.170.198	10.76.170.199
51	10.76.170.200/30	10.76.170.201 – 10.76.170.202	10.76.170.203
52	10.76.170.204/30	10.76.170.205 – 10.76.170.206	10.76.170.207
53	10.76.170.208/30	10.76.170.209 – 10.76.170.210	10.76.170.211
54	10.76.170.212/30	10.76.170.213 – 10.76.170.214	10.76.170.215
55	10.76.170.216/30	10.76.170.217 – 10.76.170.218	10.76.170.219
56	10.76.170.220/30	10.76.170.221 – 10.76.170.222	10.76.170.223
57	10.76.170.224/30	10.76.170.225 – 10.76.170.226	10.76.170.227
58	10.76.170.228/30	10.76.170.229 – 10.76.170.230	10.76.170.231
59	10.76.170.232/30	10.76.170.233 – 10.76.170.234	10.76.170.235
60	10.76.170.236/30	10.76.170.237 – 10.76.170.238	10.76.170.239
61	10.76.170.240/30	10.76.170.241 – 10.76.170.242	10.76.170.243
62	10.76.170.244/30	10.76.170.245 – 10.76.170.246	10.76.170.247
63	10.76.170.248/30	10.76.170.249 – 10.76.170.250	10.76.170.251
64	10.76.170.252/30	10.76.170.253 – 10.76.170.254	10.76.170.255
65	10.76.171.0/30	10.76.171.1 – 10.76.171.2	10.76.171.3
66	10.76.171.4/30	10.76.171.5 – 10.76.171.6	10.76.171.7
67	10.76.171.8/30	10.76.171.9 – 10.76.171.10	10.76.171.11
68	10.76.171.12/30	10.76.171.13 – 10.76.171.14	10.76.171.15
69	10.76.171.16/30	10.76.171.17 – 10.76.171.18	10.76.171.19
70	10.76.171.20/30	10.76.171.21 – 10.76.171.22	10.76.171.23
71	10.76.171.24/30	10.76.171.25 – 10.76.171.26	10.76.171.27
72	10.76.171.28/30	10.76.171.29 – 10.76.171.30	10.76.171.31
73	10.76.171.32/30	10.76.171.33 – 10.76.171.34	10.76.171.35
74	10.76.171.36/30	10.76.171.37 – 10.76.171.38	10.76.171.39
75	10.76.171.40/30	10.76.171.41 – 10.76.171.42	10.76.171.43
76	10.76.171.44/30	10.76.171.45 – 10.76.171.46	10.76.171.47
77	10.76.171.48/30	10.76.171.49 – 10.76.171.50	10.76.171.51
78	10.76.171.52/30	10.76.171.53 – 10.76.171.54	10.76.171.55
79	10.76.171.56/30	10.76.171.57 – 10.76.171.58	10.76.171.59
80	10.76.171.60/30	10.76.171.61 – 10.76.171.62	10.76.171.63
81	10.76.171.64/30	10.76.171.65 – 10.76.171.66	10.76.171.67
82	10.76.171.68/30	10.76.171.69 – 10.76.171.70	10.76.171.71
83	10.76.171.72/30	10.76.171.73 – 10.76.171.74	10.76.171.75
84	10.76.171.76/30	10.76.171.77 – 10.76.171.78	10.76.171.79
85	10.76.171.80/30	10.76.171.81 – 10.76.171.82	10.76.171.83
86	10.76.171.84/30	10.76.171.85 – 10.76.171.86	10.76.171.87
87	10.76.171.88/30	10.76.171.89 – 10.76.171.90	10.76.171.91
88	10.76.171.92/30	10.76.171.93 – 10.76.171.94	10.76.171.95
89	10.76.171.96/30	10.76.171.97 – 10.76.171.98	10.76.171.99
90	10.76.171.100/30	10.76.171.101 – 10.76.171.102	10.76.171.103
91	10.76.171.104/30	10.76.171.105 – 10.76.171.106	10.76.171.107
92	10.76.171.108/30	10.76.171.109 – 10.76.171.110	10.76.171.111
93	10.76.171.112/30	10.76.171.113 – 10.76.171.114	10.76.171.115
94	10.76.171.116/30	10.76.171.117 – 10.76.171.118	10.76.171.119
95	10.76.171.120/30	10.76.171.121 – 10.76.171.122	10.76.171.123
96	10.76.171.124/30	10.76.171.125 – 10.76.171.126	10.76.171.127
97	10.76.171.128/30	10.76.171.129 – 10.76.171.130	10.76.171.131
98	10.76.171.132/30	10.76.171.133 – 10.76.171.134	10.76.171.135
99	10.76.171.136/30	10.76.171.137 – 10.76.171.138	10.76.171.139
100	10.76.171.140/30	10.76.171.141 – 10.76.171.142	10.76.171.143
101	10.76.171.144/30	10.76.171.145 – 10.76.171.146	10.76.171.147
102	10.76.171.148/30	10.76.171.149 – 10.76.171.150	10.76.171.151
103	10.76.171.152/30	10.76.171.153 – 10.76.171.154	10.76.171.155
104	10.76.171.156/30	10.76.171.157 – 10.76.171.158	10.76.171.159
105	10.76.171.160/30	10.76.171.161 – 10.76.171.162	10.76.171.163
106	10.76.171.164/30	10.76.171.165 – 10.76.171.166	10.76.171.167
107	10.76.171.168/30	10.76.171.169 – 10.76.171.170	10.76.171.171
108	10.76.171.172/30	10.76.171.173 – 10.76.171.174	10.76.171.175
109	10.76.171.176/30	10.76.171.177 – 10.76.171.178	10.76.171.179
110	10.76.171.180/30	10.76.171.181 – 10.76.171.182	10.76.171.183
111	10.76.171.184/30	10.76.171.185 – 10.76.171.186	10.76.171.187
112	10.76.171.188/30	10.76.171.189 – 10.76.171.190	10.76.171.191
113	10.76.171.192/30	10.76.171.193 – 10.76.171.194	10.76.171.195
114	10.76.171.196/30	10.76.171.197 – 10.76.171.198	10.76.171.199
115	10.76.171.200/30	10.76.171.201 – 10.76.171.202	10.76.171.203
116	10.76.171.204/30	10.76.171.205 – 10.76.171.206	10.76.171.207
117	10.76.171.208/30	10.76.171.209 – 10.76.171.210	10.76.171.211
118	10.76.171.212/30	10.76.171.213 – 10.76.171.214	10.76.171.215
119	10.76.171.216/30	10.76.171.217 – 10.76.171.218	10.76.171.219
120	10.76.171.220/30	10.76.171.221 – 10.76.171.222	10.76.171.223
121	10.76.171.224/30	10.76.171.225 – 10.76.171.226	10.76.171.227
122	10.76.171.228/30	10.76.171.229 – 10.76.171.230	10.76.171.231
123	10.76.171.232/30	10.76.171.233 – 10.76.171.234	10.76.171.235
124	10.76.171.236/30	10.76.171.237 – 10.76.171.238	10.76.171.239
125	10.76.171.240/30	10.76.171.241 – 10.76.171.242	10.76.171.243
126	10.76.171.244/30	10.76.171.245 – 10.76.171.246	10.76.171.247
127	10.76.171.248/30	10.76.171.249 – 10.76.171.250	10.76.171.251
128	10.76.171.252/30	10.76.171.253 – 10.76.171.254	10.76.171.255

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 →