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)10.0.34.0/25

network10.0.34.0/25

broadcast10.0.34.127

first host10.0.34.1

last host10.0.34.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.34.0/25

address00001010.00000000.00100010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00100010.00000000

broadcast00001010.00000000.00100010.01111111

green = network part, grey = host part

hex0x0a002200

decimal167780864

reverse dns0.34.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:2200

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.34.0/32	10.0.34.0 – 10.0.34.0	10.0.34.0
2	10.0.34.1/32	10.0.34.1 – 10.0.34.1	10.0.34.1
3	10.0.34.2/32	10.0.34.2 – 10.0.34.2	10.0.34.2
4	10.0.34.3/32	10.0.34.3 – 10.0.34.3	10.0.34.3
5	10.0.34.4/32	10.0.34.4 – 10.0.34.4	10.0.34.4
6	10.0.34.5/32	10.0.34.5 – 10.0.34.5	10.0.34.5
7	10.0.34.6/32	10.0.34.6 – 10.0.34.6	10.0.34.6
8	10.0.34.7/32	10.0.34.7 – 10.0.34.7	10.0.34.7
9	10.0.34.8/32	10.0.34.8 – 10.0.34.8	10.0.34.8
10	10.0.34.9/32	10.0.34.9 – 10.0.34.9	10.0.34.9
11	10.0.34.10/32	10.0.34.10 – 10.0.34.10	10.0.34.10
12	10.0.34.11/32	10.0.34.11 – 10.0.34.11	10.0.34.11
13	10.0.34.12/32	10.0.34.12 – 10.0.34.12	10.0.34.12
14	10.0.34.13/32	10.0.34.13 – 10.0.34.13	10.0.34.13
15	10.0.34.14/32	10.0.34.14 – 10.0.34.14	10.0.34.14
16	10.0.34.15/32	10.0.34.15 – 10.0.34.15	10.0.34.15
17	10.0.34.16/32	10.0.34.16 – 10.0.34.16	10.0.34.16
18	10.0.34.17/32	10.0.34.17 – 10.0.34.17	10.0.34.17
19	10.0.34.18/32	10.0.34.18 – 10.0.34.18	10.0.34.18
20	10.0.34.19/32	10.0.34.19 – 10.0.34.19	10.0.34.19
21	10.0.34.20/32	10.0.34.20 – 10.0.34.20	10.0.34.20
22	10.0.34.21/32	10.0.34.21 – 10.0.34.21	10.0.34.21
23	10.0.34.22/32	10.0.34.22 – 10.0.34.22	10.0.34.22
24	10.0.34.23/32	10.0.34.23 – 10.0.34.23	10.0.34.23
25	10.0.34.24/32	10.0.34.24 – 10.0.34.24	10.0.34.24
26	10.0.34.25/32	10.0.34.25 – 10.0.34.25	10.0.34.25
27	10.0.34.26/32	10.0.34.26 – 10.0.34.26	10.0.34.26
28	10.0.34.27/32	10.0.34.27 – 10.0.34.27	10.0.34.27
29	10.0.34.28/32	10.0.34.28 – 10.0.34.28	10.0.34.28
30	10.0.34.29/32	10.0.34.29 – 10.0.34.29	10.0.34.29
31	10.0.34.30/32	10.0.34.30 – 10.0.34.30	10.0.34.30
32	10.0.34.31/32	10.0.34.31 – 10.0.34.31	10.0.34.31
33	10.0.34.32/32	10.0.34.32 – 10.0.34.32	10.0.34.32
34	10.0.34.33/32	10.0.34.33 – 10.0.34.33	10.0.34.33
35	10.0.34.34/32	10.0.34.34 – 10.0.34.34	10.0.34.34
36	10.0.34.35/32	10.0.34.35 – 10.0.34.35	10.0.34.35
37	10.0.34.36/32	10.0.34.36 – 10.0.34.36	10.0.34.36
38	10.0.34.37/32	10.0.34.37 – 10.0.34.37	10.0.34.37
39	10.0.34.38/32	10.0.34.38 – 10.0.34.38	10.0.34.38
40	10.0.34.39/32	10.0.34.39 – 10.0.34.39	10.0.34.39
41	10.0.34.40/32	10.0.34.40 – 10.0.34.40	10.0.34.40
42	10.0.34.41/32	10.0.34.41 – 10.0.34.41	10.0.34.41
43	10.0.34.42/32	10.0.34.42 – 10.0.34.42	10.0.34.42
44	10.0.34.43/32	10.0.34.43 – 10.0.34.43	10.0.34.43
45	10.0.34.44/32	10.0.34.44 – 10.0.34.44	10.0.34.44
46	10.0.34.45/32	10.0.34.45 – 10.0.34.45	10.0.34.45
47	10.0.34.46/32	10.0.34.46 – 10.0.34.46	10.0.34.46
48	10.0.34.47/32	10.0.34.47 – 10.0.34.47	10.0.34.47
49	10.0.34.48/32	10.0.34.48 – 10.0.34.48	10.0.34.48
50	10.0.34.49/32	10.0.34.49 – 10.0.34.49	10.0.34.49
51	10.0.34.50/32	10.0.34.50 – 10.0.34.50	10.0.34.50
52	10.0.34.51/32	10.0.34.51 – 10.0.34.51	10.0.34.51
53	10.0.34.52/32	10.0.34.52 – 10.0.34.52	10.0.34.52
54	10.0.34.53/32	10.0.34.53 – 10.0.34.53	10.0.34.53
55	10.0.34.54/32	10.0.34.54 – 10.0.34.54	10.0.34.54
56	10.0.34.55/32	10.0.34.55 – 10.0.34.55	10.0.34.55
57	10.0.34.56/32	10.0.34.56 – 10.0.34.56	10.0.34.56
58	10.0.34.57/32	10.0.34.57 – 10.0.34.57	10.0.34.57
59	10.0.34.58/32	10.0.34.58 – 10.0.34.58	10.0.34.58
60	10.0.34.59/32	10.0.34.59 – 10.0.34.59	10.0.34.59
61	10.0.34.60/32	10.0.34.60 – 10.0.34.60	10.0.34.60
62	10.0.34.61/32	10.0.34.61 – 10.0.34.61	10.0.34.61
63	10.0.34.62/32	10.0.34.62 – 10.0.34.62	10.0.34.62
64	10.0.34.63/32	10.0.34.63 – 10.0.34.63	10.0.34.63
65	10.0.34.64/32	10.0.34.64 – 10.0.34.64	10.0.34.64
66	10.0.34.65/32	10.0.34.65 – 10.0.34.65	10.0.34.65
67	10.0.34.66/32	10.0.34.66 – 10.0.34.66	10.0.34.66
68	10.0.34.67/32	10.0.34.67 – 10.0.34.67	10.0.34.67
69	10.0.34.68/32	10.0.34.68 – 10.0.34.68	10.0.34.68
70	10.0.34.69/32	10.0.34.69 – 10.0.34.69	10.0.34.69
71	10.0.34.70/32	10.0.34.70 – 10.0.34.70	10.0.34.70
72	10.0.34.71/32	10.0.34.71 – 10.0.34.71	10.0.34.71
73	10.0.34.72/32	10.0.34.72 – 10.0.34.72	10.0.34.72
74	10.0.34.73/32	10.0.34.73 – 10.0.34.73	10.0.34.73
75	10.0.34.74/32	10.0.34.74 – 10.0.34.74	10.0.34.74
76	10.0.34.75/32	10.0.34.75 – 10.0.34.75	10.0.34.75
77	10.0.34.76/32	10.0.34.76 – 10.0.34.76	10.0.34.76
78	10.0.34.77/32	10.0.34.77 – 10.0.34.77	10.0.34.77
79	10.0.34.78/32	10.0.34.78 – 10.0.34.78	10.0.34.78
80	10.0.34.79/32	10.0.34.79 – 10.0.34.79	10.0.34.79
81	10.0.34.80/32	10.0.34.80 – 10.0.34.80	10.0.34.80
82	10.0.34.81/32	10.0.34.81 – 10.0.34.81	10.0.34.81
83	10.0.34.82/32	10.0.34.82 – 10.0.34.82	10.0.34.82
84	10.0.34.83/32	10.0.34.83 – 10.0.34.83	10.0.34.83
85	10.0.34.84/32	10.0.34.84 – 10.0.34.84	10.0.34.84
86	10.0.34.85/32	10.0.34.85 – 10.0.34.85	10.0.34.85
87	10.0.34.86/32	10.0.34.86 – 10.0.34.86	10.0.34.86
88	10.0.34.87/32	10.0.34.87 – 10.0.34.87	10.0.34.87
89	10.0.34.88/32	10.0.34.88 – 10.0.34.88	10.0.34.88
90	10.0.34.89/32	10.0.34.89 – 10.0.34.89	10.0.34.89
91	10.0.34.90/32	10.0.34.90 – 10.0.34.90	10.0.34.90
92	10.0.34.91/32	10.0.34.91 – 10.0.34.91	10.0.34.91
93	10.0.34.92/32	10.0.34.92 – 10.0.34.92	10.0.34.92
94	10.0.34.93/32	10.0.34.93 – 10.0.34.93	10.0.34.93
95	10.0.34.94/32	10.0.34.94 – 10.0.34.94	10.0.34.94
96	10.0.34.95/32	10.0.34.95 – 10.0.34.95	10.0.34.95
97	10.0.34.96/32	10.0.34.96 – 10.0.34.96	10.0.34.96
98	10.0.34.97/32	10.0.34.97 – 10.0.34.97	10.0.34.97
99	10.0.34.98/32	10.0.34.98 – 10.0.34.98	10.0.34.98
100	10.0.34.99/32	10.0.34.99 – 10.0.34.99	10.0.34.99
101	10.0.34.100/32	10.0.34.100 – 10.0.34.100	10.0.34.100
102	10.0.34.101/32	10.0.34.101 – 10.0.34.101	10.0.34.101
103	10.0.34.102/32	10.0.34.102 – 10.0.34.102	10.0.34.102
104	10.0.34.103/32	10.0.34.103 – 10.0.34.103	10.0.34.103
105	10.0.34.104/32	10.0.34.104 – 10.0.34.104	10.0.34.104
106	10.0.34.105/32	10.0.34.105 – 10.0.34.105	10.0.34.105
107	10.0.34.106/32	10.0.34.106 – 10.0.34.106	10.0.34.106
108	10.0.34.107/32	10.0.34.107 – 10.0.34.107	10.0.34.107
109	10.0.34.108/32	10.0.34.108 – 10.0.34.108	10.0.34.108
110	10.0.34.109/32	10.0.34.109 – 10.0.34.109	10.0.34.109
111	10.0.34.110/32	10.0.34.110 – 10.0.34.110	10.0.34.110
112	10.0.34.111/32	10.0.34.111 – 10.0.34.111	10.0.34.111
113	10.0.34.112/32	10.0.34.112 – 10.0.34.112	10.0.34.112
114	10.0.34.113/32	10.0.34.113 – 10.0.34.113	10.0.34.113
115	10.0.34.114/32	10.0.34.114 – 10.0.34.114	10.0.34.114
116	10.0.34.115/32	10.0.34.115 – 10.0.34.115	10.0.34.115
117	10.0.34.116/32	10.0.34.116 – 10.0.34.116	10.0.34.116
118	10.0.34.117/32	10.0.34.117 – 10.0.34.117	10.0.34.117
119	10.0.34.118/32	10.0.34.118 – 10.0.34.118	10.0.34.118
120	10.0.34.119/32	10.0.34.119 – 10.0.34.119	10.0.34.119
121	10.0.34.120/32	10.0.34.120 – 10.0.34.120	10.0.34.120
122	10.0.34.121/32	10.0.34.121 – 10.0.34.121	10.0.34.121
123	10.0.34.122/32	10.0.34.122 – 10.0.34.122	10.0.34.122
124	10.0.34.123/32	10.0.34.123 – 10.0.34.123	10.0.34.123
125	10.0.34.124/32	10.0.34.124 – 10.0.34.124	10.0.34.124
126	10.0.34.125/32	10.0.34.125 – 10.0.34.125	10.0.34.125
127	10.0.34.126/32	10.0.34.126 – 10.0.34.126	10.0.34.126
128	10.0.34.127/32	10.0.34.127 – 10.0.34.127	10.0.34.127

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 →