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	diff --git a/app/models/a.rb b/app/models/a.rb
	new file mode 100644
	index 0000000..2ccf7e4
	--- /dev/null
	+++ b/app/models/a.rb
	@@ -0,0 +1,4 @@
	+class A < Record
	+ validates :content, presence: true, ipv4: true
	+ validates :name, presence: true
	+end
	diff --git a/lib/ipv4_validator.rb b/lib/ipv4_validator.rb
	new file mode 100644
	index 0000000..55b4165
	--- /dev/null
	+++ b/lib/ipv4_validator.rb
	@@ -0,0 +1,17 @@
	+require 'ipaddr'
	+require 'socket'
	+
	+class Ipv4Validator < ActiveModel::EachValidator
	+ def valid_v4?(addr)
	+ return false if addr['/'] # IPAddr accepts addr/mask format
	+ IPAddr.new(addr, Socket::AF_INET)
	+ true
	+ rescue IPAddr::AddressFamilyError, IPAddr::InvalidAddressError
	+ false
	+ end
	+
	+ def validate_each(record, attribute, value)
	+ return if valid_v4?(value)
	+ record.errors[attribute] << 'is not a valid IPv4 address'
	+ end
	+end