Find IP IPv4 Network/Subnet and its host address ranges

What is an IPv4 IP address its network and host address ranges?

An IPv4 IP address is an address used in order to uniquely identify a device on an IP network. The address is made up of 32 binary bits, which can be divisible into a network portion and host portion with the help of a subnet mask. The 32 binary bits are broken into four octets (1 octet = 8 bits). Each octet is converted to decimal and separated by a period (dot).

How to Subnet IPv4? Its simple answer is that subnetting is the process of taking a network and splitting it into smaller networks, known as subnets. It's used to free up more public IPv4 addresses and segment networks for security and easier management.
Following are the ranges of IPv4 subnet/network address and their host addresses.

IPv4 AddressIPv6 Address
3.123.128.1 0:0:0:0:0:ffff:37b:8001
3.123.128.2 0:0:0:0:0:ffff:37b:8002
3.123.128.3 0:0:0:0:0:ffff:37b:8003
3.123.128.4 0:0:0:0:0:ffff:37b:8004
3.123.128.5 0:0:0:0:0:ffff:37b:8005
3.123.128.6 0:0:0:0:0:ffff:37b:8006
3.123.128.7 0:0:0:0:0:ffff:37b:8007
3.123.128.8 0:0:0:0:0:ffff:37b:8008
3.123.128.9 0:0:0:0:0:ffff:37b:8009
3.123.128.10 0:0:0:0:0:ffff:37b:800a
3.123.128.11 0:0:0:0:0:ffff:37b:800b
3.123.128.12 0:0:0:0:0:ffff:37b:800c
3.123.128.13 0:0:0:0:0:ffff:37b:800d
3.123.128.14 0:0:0:0:0:ffff:37b:800e
3.123.128.15 0:0:0:0:0:ffff:37b:800f
3.123.128.16 0:0:0:0:0:ffff:37b:8010
3.123.128.17 0:0:0:0:0:ffff:37b:8011
3.123.128.18 0:0:0:0:0:ffff:37b:8012
3.123.128.19 0:0:0:0:0:ffff:37b:8013
3.123.128.20 0:0:0:0:0:ffff:37b:8014
3.123.128.21 0:0:0:0:0:ffff:37b:8015
3.123.128.22 0:0:0:0:0:ffff:37b:8016
3.123.128.23 0:0:0:0:0:ffff:37b:8017
3.123.128.24 0:0:0:0:0:ffff:37b:8018
3.123.128.25 0:0:0:0:0:ffff:37b:8019
3.123.128.26 0:0:0:0:0:ffff:37b:801a
3.123.128.27 0:0:0:0:0:ffff:37b:801b
3.123.128.28 0:0:0:0:0:ffff:37b:801c
3.123.128.29 0:0:0:0:0:ffff:37b:801d
3.123.128.30 0:0:0:0:0:ffff:37b:801e
3.123.128.31 0:0:0:0:0:ffff:37b:801f
3.123.128.32 0:0:0:0:0:ffff:37b:8020
3.123.128.33 0:0:0:0:0:ffff:37b:8021
3.123.128.34 0:0:0:0:0:ffff:37b:8022
3.123.128.35 0:0:0:0:0:ffff:37b:8023
3.123.128.36 0:0:0:0:0:ffff:37b:8024
3.123.128.37 0:0:0:0:0:ffff:37b:8025
3.123.128.38 0:0:0:0:0:ffff:37b:8026
3.123.128.39 0:0:0:0:0:ffff:37b:8027
3.123.128.40 0:0:0:0:0:ffff:37b:8028
3.123.128.41 0:0:0:0:0:ffff:37b:8029
3.123.128.42 0:0:0:0:0:ffff:37b:802a
3.123.128.43 0:0:0:0:0:ffff:37b:802b
3.123.128.44 0:0:0:0:0:ffff:37b:802c
3.123.128.45 0:0:0:0:0:ffff:37b:802d
3.123.128.46 0:0:0:0:0:ffff:37b:802e
3.123.128.47 0:0:0:0:0:ffff:37b:802f
3.123.128.48 0:0:0:0:0:ffff:37b:8030
3.123.128.49 0:0:0:0:0:ffff:37b:8031
3.123.128.50 0:0:0:0:0:ffff:37b:8032
3.123.128.51 0:0:0:0:0:ffff:37b:8033
3.123.128.52 0:0:0:0:0:ffff:37b:8034
3.123.128.53 0:0:0:0:0:ffff:37b:8035
3.123.128.54 0:0:0:0:0:ffff:37b:8036
3.123.128.55 0:0:0:0:0:ffff:37b:8037
3.123.128.56 0:0:0:0:0:ffff:37b:8038
3.123.128.57 0:0:0:0:0:ffff:37b:8039
3.123.128.58 0:0:0:0:0:ffff:37b:803a
3.123.128.59 0:0:0:0:0:ffff:37b:803b
3.123.128.60 0:0:0:0:0:ffff:37b:803c


3.123.128.61 0:0:0:0:0:ffff:37b:803d
3.123.128.62 0:0:0:0:0:ffff:37b:803e
3.123.128.63 0:0:0:0:0:ffff:37b:803f
3.123.128.64 0:0:0:0:0:ffff:37b:8040
3.123.128.65 0:0:0:0:0:ffff:37b:8041
3.123.128.66 0:0:0:0:0:ffff:37b:8042
3.123.128.67 0:0:0:0:0:ffff:37b:8043
3.123.128.68 0:0:0:0:0:ffff:37b:8044
3.123.128.69 0:0:0:0:0:ffff:37b:8045
3.123.128.70 0:0:0:0:0:ffff:37b:8046
3.123.128.71 0:0:0:0:0:ffff:37b:8047
3.123.128.72 0:0:0:0:0:ffff:37b:8048
3.123.128.73 0:0:0:0:0:ffff:37b:8049
3.123.128.74 0:0:0:0:0:ffff:37b:804a
3.123.128.75 0:0:0:0:0:ffff:37b:804b
3.123.128.76 0:0:0:0:0:ffff:37b:804c
3.123.128.77 0:0:0:0:0:ffff:37b:804d
3.123.128.78 0:0:0:0:0:ffff:37b:804e
3.123.128.79 0:0:0:0:0:ffff:37b:804f
3.123.128.80 0:0:0:0:0:ffff:37b:8050
3.123.128.81 0:0:0:0:0:ffff:37b:8051
3.123.128.82 0:0:0:0:0:ffff:37b:8052
3.123.128.83 0:0:0:0:0:ffff:37b:8053
3.123.128.84 0:0:0:0:0:ffff:37b:8054
3.123.128.85 0:0:0:0:0:ffff:37b:8055
3.123.128.86 0:0:0:0:0:ffff:37b:8056
3.123.128.87 0:0:0:0:0:ffff:37b:8057
3.123.128.88 0:0:0:0:0:ffff:37b:8058
3.123.128.89 0:0:0:0:0:ffff:37b:8059
3.123.128.90 0:0:0:0:0:ffff:37b:805a
3.123.128.91 0:0:0:0:0:ffff:37b:805b
3.123.128.92 0:0:0:0:0:ffff:37b:805c
3.123.128.93 0:0:0:0:0:ffff:37b:805d
3.123.128.94 0:0:0:0:0:ffff:37b:805e
3.123.128.95 0:0:0:0:0:ffff:37b:805f
3.123.128.96 0:0:0:0:0:ffff:37b:8060
3.123.128.97 0:0:0:0:0:ffff:37b:8061
3.123.128.98 0:0:0:0:0:ffff:37b:8062
3.123.128.99 0:0:0:0:0:ffff:37b:8063
3.123.128.100 0:0:0:0:0:ffff:37b:8064
3.123.128.101 0:0:0:0:0:ffff:37b:8065
3.123.128.102 0:0:0:0:0:ffff:37b:8066
3.123.128.103 0:0:0:0:0:ffff:37b:8067
3.123.128.104 0:0:0:0:0:ffff:37b:8068
3.123.128.105 0:0:0:0:0:ffff:37b:8069
3.123.128.106 0:0:0:0:0:ffff:37b:806a
3.123.128.107 0:0:0:0:0:ffff:37b:806b
3.123.128.108 0:0:0:0:0:ffff:37b:806c
3.123.128.109 0:0:0:0:0:ffff:37b:806d
3.123.128.110 0:0:0:0:0:ffff:37b:806e
3.123.128.111 0:0:0:0:0:ffff:37b:806f
3.123.128.112 0:0:0:0:0:ffff:37b:8070
3.123.128.113 0:0:0:0:0:ffff:37b:8071
3.123.128.114 0:0:0:0:0:ffff:37b:8072
3.123.128.115 0:0:0:0:0:ffff:37b:8073
3.123.128.116 0:0:0:0:0:ffff:37b:8074
3.123.128.117 0:0:0:0:0:ffff:37b:8075
3.123.128.118 0:0:0:0:0:ffff:37b:8076
3.123.128.119 0:0:0:0:0:ffff:37b:8077
3.123.128.120 0:0:0:0:0:ffff:37b:8078


3.123.128.121 0:0:0:0:0:ffff:37b:8079
3.123.128.122 0:0:0:0:0:ffff:37b:807a
3.123.128.123 0:0:0:0:0:ffff:37b:807b
3.123.128.124 0:0:0:0:0:ffff:37b:807c
3.123.128.125 0:0:0:0:0:ffff:37b:807d
3.123.128.126 0:0:0:0:0:ffff:37b:807e
3.123.128.127 0:0:0:0:0:ffff:37b:807f
3.123.128.128 0:0:0:0:0:ffff:37b:8080
3.123.128.129 0:0:0:0:0:ffff:37b:8081
3.123.128.130 0:0:0:0:0:ffff:37b:8082
3.123.128.131 0:0:0:0:0:ffff:37b:8083
3.123.128.132 0:0:0:0:0:ffff:37b:8084
3.123.128.133 0:0:0:0:0:ffff:37b:8085
3.123.128.134 0:0:0:0:0:ffff:37b:8086
3.123.128.135 0:0:0:0:0:ffff:37b:8087
3.123.128.136 0:0:0:0:0:ffff:37b:8088
3.123.128.137 0:0:0:0:0:ffff:37b:8089
3.123.128.138 0:0:0:0:0:ffff:37b:808a
3.123.128.139 0:0:0:0:0:ffff:37b:808b
3.123.128.140 0:0:0:0:0:ffff:37b:808c
3.123.128.141 0:0:0:0:0:ffff:37b:808d
3.123.128.142 0:0:0:0:0:ffff:37b:808e
3.123.128.143 0:0:0:0:0:ffff:37b:808f
3.123.128.144 0:0:0:0:0:ffff:37b:8090
3.123.128.145 0:0:0:0:0:ffff:37b:8091
3.123.128.146 0:0:0:0:0:ffff:37b:8092
3.123.128.147 0:0:0:0:0:ffff:37b:8093
3.123.128.148 0:0:0:0:0:ffff:37b:8094
3.123.128.149 0:0:0:0:0:ffff:37b:8095
3.123.128.150 0:0:0:0:0:ffff:37b:8096
3.123.128.151 0:0:0:0:0:ffff:37b:8097
3.123.128.152 0:0:0:0:0:ffff:37b:8098
3.123.128.153 0:0:0:0:0:ffff:37b:8099
3.123.128.154 0:0:0:0:0:ffff:37b:809a
3.123.128.155 0:0:0:0:0:ffff:37b:809b
3.123.128.156 0:0:0:0:0:ffff:37b:809c
3.123.128.157 0:0:0:0:0:ffff:37b:809d
3.123.128.158 0:0:0:0:0:ffff:37b:809e
3.123.128.159 0:0:0:0:0:ffff:37b:809f
3.123.128.160 0:0:0:0:0:ffff:37b:80a0
3.123.128.161 0:0:0:0:0:ffff:37b:80a1
3.123.128.162 0:0:0:0:0:ffff:37b:80a2
3.123.128.163 0:0:0:0:0:ffff:37b:80a3
3.123.128.164 0:0:0:0:0:ffff:37b:80a4
3.123.128.165 0:0:0:0:0:ffff:37b:80a5
3.123.128.166 0:0:0:0:0:ffff:37b:80a6
3.123.128.167 0:0:0:0:0:ffff:37b:80a7
3.123.128.168 0:0:0:0:0:ffff:37b:80a8
3.123.128.169 0:0:0:0:0:ffff:37b:80a9
3.123.128.170 0:0:0:0:0:ffff:37b:80aa
3.123.128.171 0:0:0:0:0:ffff:37b:80ab
3.123.128.172 0:0:0:0:0:ffff:37b:80ac
3.123.128.173 0:0:0:0:0:ffff:37b:80ad
3.123.128.174 0:0:0:0:0:ffff:37b:80ae
3.123.128.175 0:0:0:0:0:ffff:37b:80af
3.123.128.176 0:0:0:0:0:ffff:37b:80b0
3.123.128.177 0:0:0:0:0:ffff:37b:80b1
3.123.128.178 0:0:0:0:0:ffff:37b:80b2
3.123.128.179 0:0:0:0:0:ffff:37b:80b3
3.123.128.180 0:0:0:0:0:ffff:37b:80b4


3.123.128.181 0:0:0:0:0:ffff:37b:80b5
3.123.128.182 0:0:0:0:0:ffff:37b:80b6
3.123.128.183 0:0:0:0:0:ffff:37b:80b7
3.123.128.184 0:0:0:0:0:ffff:37b:80b8
3.123.128.185 0:0:0:0:0:ffff:37b:80b9
3.123.128.186 0:0:0:0:0:ffff:37b:80ba
3.123.128.187 0:0:0:0:0:ffff:37b:80bb
3.123.128.188 0:0:0:0:0:ffff:37b:80bc
3.123.128.189 0:0:0:0:0:ffff:37b:80bd
3.123.128.190 0:0:0:0:0:ffff:37b:80be
3.123.128.191 0:0:0:0:0:ffff:37b:80bf
3.123.128.192 0:0:0:0:0:ffff:37b:80c0
3.123.128.193 0:0:0:0:0:ffff:37b:80c1
3.123.128.194 0:0:0:0:0:ffff:37b:80c2
3.123.128.195 0:0:0:0:0:ffff:37b:80c3
3.123.128.196 0:0:0:0:0:ffff:37b:80c4
3.123.128.197 0:0:0:0:0:ffff:37b:80c5
3.123.128.198 0:0:0:0:0:ffff:37b:80c6
3.123.128.199 0:0:0:0:0:ffff:37b:80c7
3.123.128.200 0:0:0:0:0:ffff:37b:80c8
3.123.128.201 0:0:0:0:0:ffff:37b:80c9
3.123.128.202 0:0:0:0:0:ffff:37b:80ca
3.123.128.203 0:0:0:0:0:ffff:37b:80cb
3.123.128.204 0:0:0:0:0:ffff:37b:80cc
3.123.128.205 0:0:0:0:0:ffff:37b:80cd
3.123.128.206 0:0:0:0:0:ffff:37b:80ce
3.123.128.207 0:0:0:0:0:ffff:37b:80cf
3.123.128.208 0:0:0:0:0:ffff:37b:80d0
3.123.128.209 0:0:0:0:0:ffff:37b:80d1
3.123.128.210 0:0:0:0:0:ffff:37b:80d2
3.123.128.211 0:0:0:0:0:ffff:37b:80d3
3.123.128.212 0:0:0:0:0:ffff:37b:80d4
3.123.128.213 0:0:0:0:0:ffff:37b:80d5
3.123.128.214 0:0:0:0:0:ffff:37b:80d6
3.123.128.215 0:0:0:0:0:ffff:37b:80d7
3.123.128.216 0:0:0:0:0:ffff:37b:80d8
3.123.128.217 0:0:0:0:0:ffff:37b:80d9
3.123.128.218 0:0:0:0:0:ffff:37b:80da
3.123.128.219 0:0:0:0:0:ffff:37b:80db
3.123.128.220 0:0:0:0:0:ffff:37b:80dc
3.123.128.221 0:0:0:0:0:ffff:37b:80dd
3.123.128.222 0:0:0:0:0:ffff:37b:80de
3.123.128.223 0:0:0:0:0:ffff:37b:80df
3.123.128.224 0:0:0:0:0:ffff:37b:80e0
3.123.128.225 0:0:0:0:0:ffff:37b:80e1
3.123.128.226 0:0:0:0:0:ffff:37b:80e2
3.123.128.227 0:0:0:0:0:ffff:37b:80e3
3.123.128.228 0:0:0:0:0:ffff:37b:80e4
3.123.128.229 0:0:0:0:0:ffff:37b:80e5
3.123.128.230 0:0:0:0:0:ffff:37b:80e6
3.123.128.231 0:0:0:0:0:ffff:37b:80e7
3.123.128.232 0:0:0:0:0:ffff:37b:80e8
3.123.128.233 0:0:0:0:0:ffff:37b:80e9
3.123.128.234 0:0:0:0:0:ffff:37b:80ea
3.123.128.235 0:0:0:0:0:ffff:37b:80eb
3.123.128.236 0:0:0:0:0:ffff:37b:80ec
3.123.128.237 0:0:0:0:0:ffff:37b:80ed
3.123.128.238 0:0:0:0:0:ffff:37b:80ee
3.123.128.239 0:0:0:0:0:ffff:37b:80ef
3.123.128.240 0:0:0:0:0:ffff:37b:80f0
3.123.128.241 0:0:0:0:0:ffff:37b:80f1
3.123.128.242 0:0:0:0:0:ffff:37b:80f2
3.123.128.243 0:0:0:0:0:ffff:37b:80f3
3.123.128.244 0:0:0:0:0:ffff:37b:80f4
3.123.128.245 0:0:0:0:0:ffff:37b:80f5
3.123.128.246 0:0:0:0:0:ffff:37b:80f6
3.123.128.247 0:0:0:0:0:ffff:37b:80f7
3.123.128.248 0:0:0:0:0:ffff:37b:80f8
3.123.128.249 0:0:0:0:0:ffff:37b:80f9
3.123.128.250 0:0:0:0:0:ffff:37b:80fa
3.123.128.251 0:0:0:0:0:ffff:37b:80fb
3.123.128.252 0:0:0:0:0:ffff:37b:80fc
3.123.128.253 0:0:0:0:0:ffff:37b:80fd
3.123.128.254 0:0:0:0:0:ffff:37b:80fe
3.123.128.255 0:0:0:0:0:ffff:37b:80ff


How we got IPv4 subnet masks?

An IPv4 subnet mask consists of 32 bits; it is a sequence of ones (1) followed by a block of zeros (0). The ones indicate bits in the address used for the network prefix and the trailing block of zeros designates that part as being the host identifier.