IANA Ruby module 
Look up TCP/IP port numbers, protocols, top-level domains, et al.
Get data from the Internet Assigned Numbers Authority (IANA) and make it available to your programs.
gem install iana-data
In your Gemfile
gem 'iana-data'
require 'iana'
IANA::TLD.valid?("com")
=> true
IANA::TLD.valid?(".com")
=> true
IANA::TLD.valid?("isthisforreal")
=> false
prot = IANA::Protocol[25]
=> #<IANA::Protocol:0x00563e8bdd18a8 @protocol=25, @name="LEAF-1", @description="Leaf-1", @references=["Barry_Boehm"]>
prot.number
=> 25
port = IANA::Port[25]
=> [#<IANA::Port:0x00556cba04b600 @port=25, @keyword="smtp", @protocol="tcp", @description="Simple Mail Transfer">, #<IANA::Port:0x00556cba04b1a0 @port=25, @keyword="smtp", @protocol="udp", @description="Simple Mail Transfer">]
port.map(&:protocol)
=> ["tcp", "udp"]
IANA::Port.select port: 25, protocol: "udp"
=> {25=>[#<IANA::Port:0x00556cba1f3d90 @port=25, @keyword="smtp", @protocol="udp", @description="Simple Mail Transfer">]}
IANA::Port::DCCP[25]
=> []
IANA::Port::DCCP[8282]
=> [#<IANA::Port:0x00556cb9bc7840 @port=8282, @keyword="", @protocol="dccp", @description="Reserved">]
IANA::Port::UDP[443]
=> [#<IANA::Port:0x00556cba1a43a8 @port=443, @keyword="https", @protocol="udp", @description="http protocol over TLS/SSL">]You still need to download some data files manually, while the IANA module is rewritten to make use of open-uri everywhere.
The IANA Ruby module loads the data into conveniently searchable data structures. The flat files the IANA Ruby module consume as data are hosted at iana.org. You will need to fetch them so you can process the content locally. I grab these files with with curl (but you can use wget or whatever if you don't use curl):
curl -L -O http://www.iana.org/assignments/ethernet-numbers
When you run the example programs, do it like so:
ruby examples/ports.rb port-numbers
Use these example programs to see how you might use and otherwise integrate IANA data functionality into your own programs.
The source is availble at https://github.com/ringe/iana
Fork, patch and send a pull request.
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