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)10.43.26.0/23

network10.43.26.0/23

broadcast10.43.27.255

first host10.43.26.1

last host10.43.27.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.43.26.0/23

address00001010.00101011.00011010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00101011.00011010.00000000

broadcast00001010.00101011.00011011.11111111

green = network part, grey = host part

hex0x0a2b1a00

decimal170596864

reverse dns0.26.43.10.in-addr.arpa

ipv4-mapped::ffff:a2b:1a00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.43.26.0/30	10.43.26.1 – 10.43.26.2	10.43.26.3
2	10.43.26.4/30	10.43.26.5 – 10.43.26.6	10.43.26.7
3	10.43.26.8/30	10.43.26.9 – 10.43.26.10	10.43.26.11
4	10.43.26.12/30	10.43.26.13 – 10.43.26.14	10.43.26.15
5	10.43.26.16/30	10.43.26.17 – 10.43.26.18	10.43.26.19
6	10.43.26.20/30	10.43.26.21 – 10.43.26.22	10.43.26.23
7	10.43.26.24/30	10.43.26.25 – 10.43.26.26	10.43.26.27
8	10.43.26.28/30	10.43.26.29 – 10.43.26.30	10.43.26.31
9	10.43.26.32/30	10.43.26.33 – 10.43.26.34	10.43.26.35
10	10.43.26.36/30	10.43.26.37 – 10.43.26.38	10.43.26.39
11	10.43.26.40/30	10.43.26.41 – 10.43.26.42	10.43.26.43
12	10.43.26.44/30	10.43.26.45 – 10.43.26.46	10.43.26.47
13	10.43.26.48/30	10.43.26.49 – 10.43.26.50	10.43.26.51
14	10.43.26.52/30	10.43.26.53 – 10.43.26.54	10.43.26.55
15	10.43.26.56/30	10.43.26.57 – 10.43.26.58	10.43.26.59
16	10.43.26.60/30	10.43.26.61 – 10.43.26.62	10.43.26.63
17	10.43.26.64/30	10.43.26.65 – 10.43.26.66	10.43.26.67
18	10.43.26.68/30	10.43.26.69 – 10.43.26.70	10.43.26.71
19	10.43.26.72/30	10.43.26.73 – 10.43.26.74	10.43.26.75
20	10.43.26.76/30	10.43.26.77 – 10.43.26.78	10.43.26.79
21	10.43.26.80/30	10.43.26.81 – 10.43.26.82	10.43.26.83
22	10.43.26.84/30	10.43.26.85 – 10.43.26.86	10.43.26.87
23	10.43.26.88/30	10.43.26.89 – 10.43.26.90	10.43.26.91
24	10.43.26.92/30	10.43.26.93 – 10.43.26.94	10.43.26.95
25	10.43.26.96/30	10.43.26.97 – 10.43.26.98	10.43.26.99
26	10.43.26.100/30	10.43.26.101 – 10.43.26.102	10.43.26.103
27	10.43.26.104/30	10.43.26.105 – 10.43.26.106	10.43.26.107
28	10.43.26.108/30	10.43.26.109 – 10.43.26.110	10.43.26.111
29	10.43.26.112/30	10.43.26.113 – 10.43.26.114	10.43.26.115
30	10.43.26.116/30	10.43.26.117 – 10.43.26.118	10.43.26.119
31	10.43.26.120/30	10.43.26.121 – 10.43.26.122	10.43.26.123
32	10.43.26.124/30	10.43.26.125 – 10.43.26.126	10.43.26.127
33	10.43.26.128/30	10.43.26.129 – 10.43.26.130	10.43.26.131
34	10.43.26.132/30	10.43.26.133 – 10.43.26.134	10.43.26.135
35	10.43.26.136/30	10.43.26.137 – 10.43.26.138	10.43.26.139
36	10.43.26.140/30	10.43.26.141 – 10.43.26.142	10.43.26.143
37	10.43.26.144/30	10.43.26.145 – 10.43.26.146	10.43.26.147
38	10.43.26.148/30	10.43.26.149 – 10.43.26.150	10.43.26.151
39	10.43.26.152/30	10.43.26.153 – 10.43.26.154	10.43.26.155
40	10.43.26.156/30	10.43.26.157 – 10.43.26.158	10.43.26.159
41	10.43.26.160/30	10.43.26.161 – 10.43.26.162	10.43.26.163
42	10.43.26.164/30	10.43.26.165 – 10.43.26.166	10.43.26.167
43	10.43.26.168/30	10.43.26.169 – 10.43.26.170	10.43.26.171
44	10.43.26.172/30	10.43.26.173 – 10.43.26.174	10.43.26.175
45	10.43.26.176/30	10.43.26.177 – 10.43.26.178	10.43.26.179
46	10.43.26.180/30	10.43.26.181 – 10.43.26.182	10.43.26.183
47	10.43.26.184/30	10.43.26.185 – 10.43.26.186	10.43.26.187
48	10.43.26.188/30	10.43.26.189 – 10.43.26.190	10.43.26.191
49	10.43.26.192/30	10.43.26.193 – 10.43.26.194	10.43.26.195
50	10.43.26.196/30	10.43.26.197 – 10.43.26.198	10.43.26.199
51	10.43.26.200/30	10.43.26.201 – 10.43.26.202	10.43.26.203
52	10.43.26.204/30	10.43.26.205 – 10.43.26.206	10.43.26.207
53	10.43.26.208/30	10.43.26.209 – 10.43.26.210	10.43.26.211
54	10.43.26.212/30	10.43.26.213 – 10.43.26.214	10.43.26.215
55	10.43.26.216/30	10.43.26.217 – 10.43.26.218	10.43.26.219
56	10.43.26.220/30	10.43.26.221 – 10.43.26.222	10.43.26.223
57	10.43.26.224/30	10.43.26.225 – 10.43.26.226	10.43.26.227
58	10.43.26.228/30	10.43.26.229 – 10.43.26.230	10.43.26.231
59	10.43.26.232/30	10.43.26.233 – 10.43.26.234	10.43.26.235
60	10.43.26.236/30	10.43.26.237 – 10.43.26.238	10.43.26.239
61	10.43.26.240/30	10.43.26.241 – 10.43.26.242	10.43.26.243
62	10.43.26.244/30	10.43.26.245 – 10.43.26.246	10.43.26.247
63	10.43.26.248/30	10.43.26.249 – 10.43.26.250	10.43.26.251
64	10.43.26.252/30	10.43.26.253 – 10.43.26.254	10.43.26.255
65	10.43.27.0/30	10.43.27.1 – 10.43.27.2	10.43.27.3
66	10.43.27.4/30	10.43.27.5 – 10.43.27.6	10.43.27.7
67	10.43.27.8/30	10.43.27.9 – 10.43.27.10	10.43.27.11
68	10.43.27.12/30	10.43.27.13 – 10.43.27.14	10.43.27.15
69	10.43.27.16/30	10.43.27.17 – 10.43.27.18	10.43.27.19
70	10.43.27.20/30	10.43.27.21 – 10.43.27.22	10.43.27.23
71	10.43.27.24/30	10.43.27.25 – 10.43.27.26	10.43.27.27
72	10.43.27.28/30	10.43.27.29 – 10.43.27.30	10.43.27.31
73	10.43.27.32/30	10.43.27.33 – 10.43.27.34	10.43.27.35
74	10.43.27.36/30	10.43.27.37 – 10.43.27.38	10.43.27.39
75	10.43.27.40/30	10.43.27.41 – 10.43.27.42	10.43.27.43
76	10.43.27.44/30	10.43.27.45 – 10.43.27.46	10.43.27.47
77	10.43.27.48/30	10.43.27.49 – 10.43.27.50	10.43.27.51
78	10.43.27.52/30	10.43.27.53 – 10.43.27.54	10.43.27.55
79	10.43.27.56/30	10.43.27.57 – 10.43.27.58	10.43.27.59
80	10.43.27.60/30	10.43.27.61 – 10.43.27.62	10.43.27.63
81	10.43.27.64/30	10.43.27.65 – 10.43.27.66	10.43.27.67
82	10.43.27.68/30	10.43.27.69 – 10.43.27.70	10.43.27.71
83	10.43.27.72/30	10.43.27.73 – 10.43.27.74	10.43.27.75
84	10.43.27.76/30	10.43.27.77 – 10.43.27.78	10.43.27.79
85	10.43.27.80/30	10.43.27.81 – 10.43.27.82	10.43.27.83
86	10.43.27.84/30	10.43.27.85 – 10.43.27.86	10.43.27.87
87	10.43.27.88/30	10.43.27.89 – 10.43.27.90	10.43.27.91
88	10.43.27.92/30	10.43.27.93 – 10.43.27.94	10.43.27.95
89	10.43.27.96/30	10.43.27.97 – 10.43.27.98	10.43.27.99
90	10.43.27.100/30	10.43.27.101 – 10.43.27.102	10.43.27.103
91	10.43.27.104/30	10.43.27.105 – 10.43.27.106	10.43.27.107
92	10.43.27.108/30	10.43.27.109 – 10.43.27.110	10.43.27.111
93	10.43.27.112/30	10.43.27.113 – 10.43.27.114	10.43.27.115
94	10.43.27.116/30	10.43.27.117 – 10.43.27.118	10.43.27.119
95	10.43.27.120/30	10.43.27.121 – 10.43.27.122	10.43.27.123
96	10.43.27.124/30	10.43.27.125 – 10.43.27.126	10.43.27.127
97	10.43.27.128/30	10.43.27.129 – 10.43.27.130	10.43.27.131
98	10.43.27.132/30	10.43.27.133 – 10.43.27.134	10.43.27.135
99	10.43.27.136/30	10.43.27.137 – 10.43.27.138	10.43.27.139
100	10.43.27.140/30	10.43.27.141 – 10.43.27.142	10.43.27.143
101	10.43.27.144/30	10.43.27.145 – 10.43.27.146	10.43.27.147
102	10.43.27.148/30	10.43.27.149 – 10.43.27.150	10.43.27.151
103	10.43.27.152/30	10.43.27.153 – 10.43.27.154	10.43.27.155
104	10.43.27.156/30	10.43.27.157 – 10.43.27.158	10.43.27.159
105	10.43.27.160/30	10.43.27.161 – 10.43.27.162	10.43.27.163
106	10.43.27.164/30	10.43.27.165 – 10.43.27.166	10.43.27.167
107	10.43.27.168/30	10.43.27.169 – 10.43.27.170	10.43.27.171
108	10.43.27.172/30	10.43.27.173 – 10.43.27.174	10.43.27.175
109	10.43.27.176/30	10.43.27.177 – 10.43.27.178	10.43.27.179
110	10.43.27.180/30	10.43.27.181 – 10.43.27.182	10.43.27.183
111	10.43.27.184/30	10.43.27.185 – 10.43.27.186	10.43.27.187
112	10.43.27.188/30	10.43.27.189 – 10.43.27.190	10.43.27.191
113	10.43.27.192/30	10.43.27.193 – 10.43.27.194	10.43.27.195
114	10.43.27.196/30	10.43.27.197 – 10.43.27.198	10.43.27.199
115	10.43.27.200/30	10.43.27.201 – 10.43.27.202	10.43.27.203
116	10.43.27.204/30	10.43.27.205 – 10.43.27.206	10.43.27.207
117	10.43.27.208/30	10.43.27.209 – 10.43.27.210	10.43.27.211
118	10.43.27.212/30	10.43.27.213 – 10.43.27.214	10.43.27.215
119	10.43.27.216/30	10.43.27.217 – 10.43.27.218	10.43.27.219
120	10.43.27.220/30	10.43.27.221 – 10.43.27.222	10.43.27.223
121	10.43.27.224/30	10.43.27.225 – 10.43.27.226	10.43.27.227
122	10.43.27.228/30	10.43.27.229 – 10.43.27.230	10.43.27.231
123	10.43.27.232/30	10.43.27.233 – 10.43.27.234	10.43.27.235
124	10.43.27.236/30	10.43.27.237 – 10.43.27.238	10.43.27.239
125	10.43.27.240/30	10.43.27.241 – 10.43.27.242	10.43.27.243
126	10.43.27.244/30	10.43.27.245 – 10.43.27.246	10.43.27.247
127	10.43.27.248/30	10.43.27.249 – 10.43.27.250	10.43.27.251
128	10.43.27.252/30	10.43.27.253 – 10.43.27.254	10.43.27.255

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 →