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)10.2.36.0/25

network10.2.36.0/25

broadcast10.2.36.127

first host10.2.36.1

last host10.2.36.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.36.0/25

address00001010.00000010.00100100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00100100.00000000

broadcast00001010.00000010.00100100.01111111

green = network part, grey = host part

hex0x0a022400

decimal167912448

reverse dns0.36.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.36.0/32	10.2.36.0 – 10.2.36.0	10.2.36.0
2	10.2.36.1/32	10.2.36.1 – 10.2.36.1	10.2.36.1
3	10.2.36.2/32	10.2.36.2 – 10.2.36.2	10.2.36.2
4	10.2.36.3/32	10.2.36.3 – 10.2.36.3	10.2.36.3
5	10.2.36.4/32	10.2.36.4 – 10.2.36.4	10.2.36.4
6	10.2.36.5/32	10.2.36.5 – 10.2.36.5	10.2.36.5
7	10.2.36.6/32	10.2.36.6 – 10.2.36.6	10.2.36.6
8	10.2.36.7/32	10.2.36.7 – 10.2.36.7	10.2.36.7
9	10.2.36.8/32	10.2.36.8 – 10.2.36.8	10.2.36.8
10	10.2.36.9/32	10.2.36.9 – 10.2.36.9	10.2.36.9
11	10.2.36.10/32	10.2.36.10 – 10.2.36.10	10.2.36.10
12	10.2.36.11/32	10.2.36.11 – 10.2.36.11	10.2.36.11
13	10.2.36.12/32	10.2.36.12 – 10.2.36.12	10.2.36.12
14	10.2.36.13/32	10.2.36.13 – 10.2.36.13	10.2.36.13
15	10.2.36.14/32	10.2.36.14 – 10.2.36.14	10.2.36.14
16	10.2.36.15/32	10.2.36.15 – 10.2.36.15	10.2.36.15
17	10.2.36.16/32	10.2.36.16 – 10.2.36.16	10.2.36.16
18	10.2.36.17/32	10.2.36.17 – 10.2.36.17	10.2.36.17
19	10.2.36.18/32	10.2.36.18 – 10.2.36.18	10.2.36.18
20	10.2.36.19/32	10.2.36.19 – 10.2.36.19	10.2.36.19
21	10.2.36.20/32	10.2.36.20 – 10.2.36.20	10.2.36.20
22	10.2.36.21/32	10.2.36.21 – 10.2.36.21	10.2.36.21
23	10.2.36.22/32	10.2.36.22 – 10.2.36.22	10.2.36.22
24	10.2.36.23/32	10.2.36.23 – 10.2.36.23	10.2.36.23
25	10.2.36.24/32	10.2.36.24 – 10.2.36.24	10.2.36.24
26	10.2.36.25/32	10.2.36.25 – 10.2.36.25	10.2.36.25
27	10.2.36.26/32	10.2.36.26 – 10.2.36.26	10.2.36.26
28	10.2.36.27/32	10.2.36.27 – 10.2.36.27	10.2.36.27
29	10.2.36.28/32	10.2.36.28 – 10.2.36.28	10.2.36.28
30	10.2.36.29/32	10.2.36.29 – 10.2.36.29	10.2.36.29
31	10.2.36.30/32	10.2.36.30 – 10.2.36.30	10.2.36.30
32	10.2.36.31/32	10.2.36.31 – 10.2.36.31	10.2.36.31
33	10.2.36.32/32	10.2.36.32 – 10.2.36.32	10.2.36.32
34	10.2.36.33/32	10.2.36.33 – 10.2.36.33	10.2.36.33
35	10.2.36.34/32	10.2.36.34 – 10.2.36.34	10.2.36.34
36	10.2.36.35/32	10.2.36.35 – 10.2.36.35	10.2.36.35
37	10.2.36.36/32	10.2.36.36 – 10.2.36.36	10.2.36.36
38	10.2.36.37/32	10.2.36.37 – 10.2.36.37	10.2.36.37
39	10.2.36.38/32	10.2.36.38 – 10.2.36.38	10.2.36.38
40	10.2.36.39/32	10.2.36.39 – 10.2.36.39	10.2.36.39
41	10.2.36.40/32	10.2.36.40 – 10.2.36.40	10.2.36.40
42	10.2.36.41/32	10.2.36.41 – 10.2.36.41	10.2.36.41
43	10.2.36.42/32	10.2.36.42 – 10.2.36.42	10.2.36.42
44	10.2.36.43/32	10.2.36.43 – 10.2.36.43	10.2.36.43
45	10.2.36.44/32	10.2.36.44 – 10.2.36.44	10.2.36.44
46	10.2.36.45/32	10.2.36.45 – 10.2.36.45	10.2.36.45
47	10.2.36.46/32	10.2.36.46 – 10.2.36.46	10.2.36.46
48	10.2.36.47/32	10.2.36.47 – 10.2.36.47	10.2.36.47
49	10.2.36.48/32	10.2.36.48 – 10.2.36.48	10.2.36.48
50	10.2.36.49/32	10.2.36.49 – 10.2.36.49	10.2.36.49
51	10.2.36.50/32	10.2.36.50 – 10.2.36.50	10.2.36.50
52	10.2.36.51/32	10.2.36.51 – 10.2.36.51	10.2.36.51
53	10.2.36.52/32	10.2.36.52 – 10.2.36.52	10.2.36.52
54	10.2.36.53/32	10.2.36.53 – 10.2.36.53	10.2.36.53
55	10.2.36.54/32	10.2.36.54 – 10.2.36.54	10.2.36.54
56	10.2.36.55/32	10.2.36.55 – 10.2.36.55	10.2.36.55
57	10.2.36.56/32	10.2.36.56 – 10.2.36.56	10.2.36.56
58	10.2.36.57/32	10.2.36.57 – 10.2.36.57	10.2.36.57
59	10.2.36.58/32	10.2.36.58 – 10.2.36.58	10.2.36.58
60	10.2.36.59/32	10.2.36.59 – 10.2.36.59	10.2.36.59
61	10.2.36.60/32	10.2.36.60 – 10.2.36.60	10.2.36.60
62	10.2.36.61/32	10.2.36.61 – 10.2.36.61	10.2.36.61
63	10.2.36.62/32	10.2.36.62 – 10.2.36.62	10.2.36.62
64	10.2.36.63/32	10.2.36.63 – 10.2.36.63	10.2.36.63
65	10.2.36.64/32	10.2.36.64 – 10.2.36.64	10.2.36.64
66	10.2.36.65/32	10.2.36.65 – 10.2.36.65	10.2.36.65
67	10.2.36.66/32	10.2.36.66 – 10.2.36.66	10.2.36.66
68	10.2.36.67/32	10.2.36.67 – 10.2.36.67	10.2.36.67
69	10.2.36.68/32	10.2.36.68 – 10.2.36.68	10.2.36.68
70	10.2.36.69/32	10.2.36.69 – 10.2.36.69	10.2.36.69
71	10.2.36.70/32	10.2.36.70 – 10.2.36.70	10.2.36.70
72	10.2.36.71/32	10.2.36.71 – 10.2.36.71	10.2.36.71
73	10.2.36.72/32	10.2.36.72 – 10.2.36.72	10.2.36.72
74	10.2.36.73/32	10.2.36.73 – 10.2.36.73	10.2.36.73
75	10.2.36.74/32	10.2.36.74 – 10.2.36.74	10.2.36.74
76	10.2.36.75/32	10.2.36.75 – 10.2.36.75	10.2.36.75
77	10.2.36.76/32	10.2.36.76 – 10.2.36.76	10.2.36.76
78	10.2.36.77/32	10.2.36.77 – 10.2.36.77	10.2.36.77
79	10.2.36.78/32	10.2.36.78 – 10.2.36.78	10.2.36.78
80	10.2.36.79/32	10.2.36.79 – 10.2.36.79	10.2.36.79
81	10.2.36.80/32	10.2.36.80 – 10.2.36.80	10.2.36.80
82	10.2.36.81/32	10.2.36.81 – 10.2.36.81	10.2.36.81
83	10.2.36.82/32	10.2.36.82 – 10.2.36.82	10.2.36.82
84	10.2.36.83/32	10.2.36.83 – 10.2.36.83	10.2.36.83
85	10.2.36.84/32	10.2.36.84 – 10.2.36.84	10.2.36.84
86	10.2.36.85/32	10.2.36.85 – 10.2.36.85	10.2.36.85
87	10.2.36.86/32	10.2.36.86 – 10.2.36.86	10.2.36.86
88	10.2.36.87/32	10.2.36.87 – 10.2.36.87	10.2.36.87
89	10.2.36.88/32	10.2.36.88 – 10.2.36.88	10.2.36.88
90	10.2.36.89/32	10.2.36.89 – 10.2.36.89	10.2.36.89
91	10.2.36.90/32	10.2.36.90 – 10.2.36.90	10.2.36.90
92	10.2.36.91/32	10.2.36.91 – 10.2.36.91	10.2.36.91
93	10.2.36.92/32	10.2.36.92 – 10.2.36.92	10.2.36.92
94	10.2.36.93/32	10.2.36.93 – 10.2.36.93	10.2.36.93
95	10.2.36.94/32	10.2.36.94 – 10.2.36.94	10.2.36.94
96	10.2.36.95/32	10.2.36.95 – 10.2.36.95	10.2.36.95
97	10.2.36.96/32	10.2.36.96 – 10.2.36.96	10.2.36.96
98	10.2.36.97/32	10.2.36.97 – 10.2.36.97	10.2.36.97
99	10.2.36.98/32	10.2.36.98 – 10.2.36.98	10.2.36.98
100	10.2.36.99/32	10.2.36.99 – 10.2.36.99	10.2.36.99
101	10.2.36.100/32	10.2.36.100 – 10.2.36.100	10.2.36.100
102	10.2.36.101/32	10.2.36.101 – 10.2.36.101	10.2.36.101
103	10.2.36.102/32	10.2.36.102 – 10.2.36.102	10.2.36.102
104	10.2.36.103/32	10.2.36.103 – 10.2.36.103	10.2.36.103
105	10.2.36.104/32	10.2.36.104 – 10.2.36.104	10.2.36.104
106	10.2.36.105/32	10.2.36.105 – 10.2.36.105	10.2.36.105
107	10.2.36.106/32	10.2.36.106 – 10.2.36.106	10.2.36.106
108	10.2.36.107/32	10.2.36.107 – 10.2.36.107	10.2.36.107
109	10.2.36.108/32	10.2.36.108 – 10.2.36.108	10.2.36.108
110	10.2.36.109/32	10.2.36.109 – 10.2.36.109	10.2.36.109
111	10.2.36.110/32	10.2.36.110 – 10.2.36.110	10.2.36.110
112	10.2.36.111/32	10.2.36.111 – 10.2.36.111	10.2.36.111
113	10.2.36.112/32	10.2.36.112 – 10.2.36.112	10.2.36.112
114	10.2.36.113/32	10.2.36.113 – 10.2.36.113	10.2.36.113
115	10.2.36.114/32	10.2.36.114 – 10.2.36.114	10.2.36.114
116	10.2.36.115/32	10.2.36.115 – 10.2.36.115	10.2.36.115
117	10.2.36.116/32	10.2.36.116 – 10.2.36.116	10.2.36.116
118	10.2.36.117/32	10.2.36.117 – 10.2.36.117	10.2.36.117
119	10.2.36.118/32	10.2.36.118 – 10.2.36.118	10.2.36.118
120	10.2.36.119/32	10.2.36.119 – 10.2.36.119	10.2.36.119
121	10.2.36.120/32	10.2.36.120 – 10.2.36.120	10.2.36.120
122	10.2.36.121/32	10.2.36.121 – 10.2.36.121	10.2.36.121
123	10.2.36.122/32	10.2.36.122 – 10.2.36.122	10.2.36.122
124	10.2.36.123/32	10.2.36.123 – 10.2.36.123	10.2.36.123
125	10.2.36.124/32	10.2.36.124 – 10.2.36.124	10.2.36.124
126	10.2.36.125/32	10.2.36.125 – 10.2.36.125	10.2.36.125
127	10.2.36.126/32	10.2.36.126 – 10.2.36.126	10.2.36.126
128	10.2.36.127/32	10.2.36.127 – 10.2.36.127	10.2.36.127

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