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)10.2.178.0/25

network10.2.178.0/25

broadcast10.2.178.127

first host10.2.178.1

last host10.2.178.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.178.0/25

address00001010.00000010.10110010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110010.00000000

broadcast00001010.00000010.10110010.01111111

green = network part, grey = host part

hex0x0a02b200

decimal167948800

reverse dns0.178.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b200

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.178.0/32	10.2.178.0 – 10.2.178.0	10.2.178.0
2	10.2.178.1/32	10.2.178.1 – 10.2.178.1	10.2.178.1
3	10.2.178.2/32	10.2.178.2 – 10.2.178.2	10.2.178.2
4	10.2.178.3/32	10.2.178.3 – 10.2.178.3	10.2.178.3
5	10.2.178.4/32	10.2.178.4 – 10.2.178.4	10.2.178.4
6	10.2.178.5/32	10.2.178.5 – 10.2.178.5	10.2.178.5
7	10.2.178.6/32	10.2.178.6 – 10.2.178.6	10.2.178.6
8	10.2.178.7/32	10.2.178.7 – 10.2.178.7	10.2.178.7
9	10.2.178.8/32	10.2.178.8 – 10.2.178.8	10.2.178.8
10	10.2.178.9/32	10.2.178.9 – 10.2.178.9	10.2.178.9
11	10.2.178.10/32	10.2.178.10 – 10.2.178.10	10.2.178.10
12	10.2.178.11/32	10.2.178.11 – 10.2.178.11	10.2.178.11
13	10.2.178.12/32	10.2.178.12 – 10.2.178.12	10.2.178.12
14	10.2.178.13/32	10.2.178.13 – 10.2.178.13	10.2.178.13
15	10.2.178.14/32	10.2.178.14 – 10.2.178.14	10.2.178.14
16	10.2.178.15/32	10.2.178.15 – 10.2.178.15	10.2.178.15
17	10.2.178.16/32	10.2.178.16 – 10.2.178.16	10.2.178.16
18	10.2.178.17/32	10.2.178.17 – 10.2.178.17	10.2.178.17
19	10.2.178.18/32	10.2.178.18 – 10.2.178.18	10.2.178.18
20	10.2.178.19/32	10.2.178.19 – 10.2.178.19	10.2.178.19
21	10.2.178.20/32	10.2.178.20 – 10.2.178.20	10.2.178.20
22	10.2.178.21/32	10.2.178.21 – 10.2.178.21	10.2.178.21
23	10.2.178.22/32	10.2.178.22 – 10.2.178.22	10.2.178.22
24	10.2.178.23/32	10.2.178.23 – 10.2.178.23	10.2.178.23
25	10.2.178.24/32	10.2.178.24 – 10.2.178.24	10.2.178.24
26	10.2.178.25/32	10.2.178.25 – 10.2.178.25	10.2.178.25
27	10.2.178.26/32	10.2.178.26 – 10.2.178.26	10.2.178.26
28	10.2.178.27/32	10.2.178.27 – 10.2.178.27	10.2.178.27
29	10.2.178.28/32	10.2.178.28 – 10.2.178.28	10.2.178.28
30	10.2.178.29/32	10.2.178.29 – 10.2.178.29	10.2.178.29
31	10.2.178.30/32	10.2.178.30 – 10.2.178.30	10.2.178.30
32	10.2.178.31/32	10.2.178.31 – 10.2.178.31	10.2.178.31
33	10.2.178.32/32	10.2.178.32 – 10.2.178.32	10.2.178.32
34	10.2.178.33/32	10.2.178.33 – 10.2.178.33	10.2.178.33
35	10.2.178.34/32	10.2.178.34 – 10.2.178.34	10.2.178.34
36	10.2.178.35/32	10.2.178.35 – 10.2.178.35	10.2.178.35
37	10.2.178.36/32	10.2.178.36 – 10.2.178.36	10.2.178.36
38	10.2.178.37/32	10.2.178.37 – 10.2.178.37	10.2.178.37
39	10.2.178.38/32	10.2.178.38 – 10.2.178.38	10.2.178.38
40	10.2.178.39/32	10.2.178.39 – 10.2.178.39	10.2.178.39
41	10.2.178.40/32	10.2.178.40 – 10.2.178.40	10.2.178.40
42	10.2.178.41/32	10.2.178.41 – 10.2.178.41	10.2.178.41
43	10.2.178.42/32	10.2.178.42 – 10.2.178.42	10.2.178.42
44	10.2.178.43/32	10.2.178.43 – 10.2.178.43	10.2.178.43
45	10.2.178.44/32	10.2.178.44 – 10.2.178.44	10.2.178.44
46	10.2.178.45/32	10.2.178.45 – 10.2.178.45	10.2.178.45
47	10.2.178.46/32	10.2.178.46 – 10.2.178.46	10.2.178.46
48	10.2.178.47/32	10.2.178.47 – 10.2.178.47	10.2.178.47
49	10.2.178.48/32	10.2.178.48 – 10.2.178.48	10.2.178.48
50	10.2.178.49/32	10.2.178.49 – 10.2.178.49	10.2.178.49
51	10.2.178.50/32	10.2.178.50 – 10.2.178.50	10.2.178.50
52	10.2.178.51/32	10.2.178.51 – 10.2.178.51	10.2.178.51
53	10.2.178.52/32	10.2.178.52 – 10.2.178.52	10.2.178.52
54	10.2.178.53/32	10.2.178.53 – 10.2.178.53	10.2.178.53
55	10.2.178.54/32	10.2.178.54 – 10.2.178.54	10.2.178.54
56	10.2.178.55/32	10.2.178.55 – 10.2.178.55	10.2.178.55
57	10.2.178.56/32	10.2.178.56 – 10.2.178.56	10.2.178.56
58	10.2.178.57/32	10.2.178.57 – 10.2.178.57	10.2.178.57
59	10.2.178.58/32	10.2.178.58 – 10.2.178.58	10.2.178.58
60	10.2.178.59/32	10.2.178.59 – 10.2.178.59	10.2.178.59
61	10.2.178.60/32	10.2.178.60 – 10.2.178.60	10.2.178.60
62	10.2.178.61/32	10.2.178.61 – 10.2.178.61	10.2.178.61
63	10.2.178.62/32	10.2.178.62 – 10.2.178.62	10.2.178.62
64	10.2.178.63/32	10.2.178.63 – 10.2.178.63	10.2.178.63
65	10.2.178.64/32	10.2.178.64 – 10.2.178.64	10.2.178.64
66	10.2.178.65/32	10.2.178.65 – 10.2.178.65	10.2.178.65
67	10.2.178.66/32	10.2.178.66 – 10.2.178.66	10.2.178.66
68	10.2.178.67/32	10.2.178.67 – 10.2.178.67	10.2.178.67
69	10.2.178.68/32	10.2.178.68 – 10.2.178.68	10.2.178.68
70	10.2.178.69/32	10.2.178.69 – 10.2.178.69	10.2.178.69
71	10.2.178.70/32	10.2.178.70 – 10.2.178.70	10.2.178.70
72	10.2.178.71/32	10.2.178.71 – 10.2.178.71	10.2.178.71
73	10.2.178.72/32	10.2.178.72 – 10.2.178.72	10.2.178.72
74	10.2.178.73/32	10.2.178.73 – 10.2.178.73	10.2.178.73
75	10.2.178.74/32	10.2.178.74 – 10.2.178.74	10.2.178.74
76	10.2.178.75/32	10.2.178.75 – 10.2.178.75	10.2.178.75
77	10.2.178.76/32	10.2.178.76 – 10.2.178.76	10.2.178.76
78	10.2.178.77/32	10.2.178.77 – 10.2.178.77	10.2.178.77
79	10.2.178.78/32	10.2.178.78 – 10.2.178.78	10.2.178.78
80	10.2.178.79/32	10.2.178.79 – 10.2.178.79	10.2.178.79
81	10.2.178.80/32	10.2.178.80 – 10.2.178.80	10.2.178.80
82	10.2.178.81/32	10.2.178.81 – 10.2.178.81	10.2.178.81
83	10.2.178.82/32	10.2.178.82 – 10.2.178.82	10.2.178.82
84	10.2.178.83/32	10.2.178.83 – 10.2.178.83	10.2.178.83
85	10.2.178.84/32	10.2.178.84 – 10.2.178.84	10.2.178.84
86	10.2.178.85/32	10.2.178.85 – 10.2.178.85	10.2.178.85
87	10.2.178.86/32	10.2.178.86 – 10.2.178.86	10.2.178.86
88	10.2.178.87/32	10.2.178.87 – 10.2.178.87	10.2.178.87
89	10.2.178.88/32	10.2.178.88 – 10.2.178.88	10.2.178.88
90	10.2.178.89/32	10.2.178.89 – 10.2.178.89	10.2.178.89
91	10.2.178.90/32	10.2.178.90 – 10.2.178.90	10.2.178.90
92	10.2.178.91/32	10.2.178.91 – 10.2.178.91	10.2.178.91
93	10.2.178.92/32	10.2.178.92 – 10.2.178.92	10.2.178.92
94	10.2.178.93/32	10.2.178.93 – 10.2.178.93	10.2.178.93
95	10.2.178.94/32	10.2.178.94 – 10.2.178.94	10.2.178.94
96	10.2.178.95/32	10.2.178.95 – 10.2.178.95	10.2.178.95
97	10.2.178.96/32	10.2.178.96 – 10.2.178.96	10.2.178.96
98	10.2.178.97/32	10.2.178.97 – 10.2.178.97	10.2.178.97
99	10.2.178.98/32	10.2.178.98 – 10.2.178.98	10.2.178.98
100	10.2.178.99/32	10.2.178.99 – 10.2.178.99	10.2.178.99
101	10.2.178.100/32	10.2.178.100 – 10.2.178.100	10.2.178.100
102	10.2.178.101/32	10.2.178.101 – 10.2.178.101	10.2.178.101
103	10.2.178.102/32	10.2.178.102 – 10.2.178.102	10.2.178.102
104	10.2.178.103/32	10.2.178.103 – 10.2.178.103	10.2.178.103
105	10.2.178.104/32	10.2.178.104 – 10.2.178.104	10.2.178.104
106	10.2.178.105/32	10.2.178.105 – 10.2.178.105	10.2.178.105
107	10.2.178.106/32	10.2.178.106 – 10.2.178.106	10.2.178.106
108	10.2.178.107/32	10.2.178.107 – 10.2.178.107	10.2.178.107
109	10.2.178.108/32	10.2.178.108 – 10.2.178.108	10.2.178.108
110	10.2.178.109/32	10.2.178.109 – 10.2.178.109	10.2.178.109
111	10.2.178.110/32	10.2.178.110 – 10.2.178.110	10.2.178.110
112	10.2.178.111/32	10.2.178.111 – 10.2.178.111	10.2.178.111
113	10.2.178.112/32	10.2.178.112 – 10.2.178.112	10.2.178.112
114	10.2.178.113/32	10.2.178.113 – 10.2.178.113	10.2.178.113
115	10.2.178.114/32	10.2.178.114 – 10.2.178.114	10.2.178.114
116	10.2.178.115/32	10.2.178.115 – 10.2.178.115	10.2.178.115
117	10.2.178.116/32	10.2.178.116 – 10.2.178.116	10.2.178.116
118	10.2.178.117/32	10.2.178.117 – 10.2.178.117	10.2.178.117
119	10.2.178.118/32	10.2.178.118 – 10.2.178.118	10.2.178.118
120	10.2.178.119/32	10.2.178.119 – 10.2.178.119	10.2.178.119
121	10.2.178.120/32	10.2.178.120 – 10.2.178.120	10.2.178.120
122	10.2.178.121/32	10.2.178.121 – 10.2.178.121	10.2.178.121
123	10.2.178.122/32	10.2.178.122 – 10.2.178.122	10.2.178.122
124	10.2.178.123/32	10.2.178.123 – 10.2.178.123	10.2.178.123
125	10.2.178.124/32	10.2.178.124 – 10.2.178.124	10.2.178.124
126	10.2.178.125/32	10.2.178.125 – 10.2.178.125	10.2.178.125
127	10.2.178.126/32	10.2.178.126 – 10.2.178.126	10.2.178.126
128	10.2.178.127/32	10.2.178.127 – 10.2.178.127	10.2.178.127

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 →