diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Author name here (c) 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,1 @@
+# rfc1413-parser
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/rfc1413-types.cabal b/rfc1413-types.cabal
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--- /dev/null
+++ b/rfc1413-types.cabal
@@ -0,0 +1,25 @@
+name:                rfc1413-types
+version:             0.0.0.0
+synopsis:            An rfc1413 parser and response renderer
+description:         Types and low level operations for rfc1413
+homepage:            https://github.com/cotrone/rfc1413-types#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Kevin Cotrone
+maintainer:          kevincotrone@gmail.com
+copyright:           2017 Kevin Cotrone
+category:            Web
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:      src
+  exposed-modules:     Data.Ident
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5
+                     , bytestring
+
+source-repository head
+  type:     git
+  location: https://github.com/cotrone/rfc1413-types
diff --git a/src/Data/Ident.hs b/src/Data/Ident.hs
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--- /dev/null
+++ b/src/Data/Ident.hs
@@ -0,0 +1,82 @@
+module Data.Ident where
+
+import Data.ByteString as BS
+import qualified Data.ByteString.Lazy as BSL
+import Data.ByteString.Char8 as BSC
+import Data.ByteString.Builder
+import Data.Monoid
+
+
+data PortPair = PortPair Int Int
+
+data Reply = ReplyError PortPair ErrorType
+           | ReplyIdent PortPair OpsysField UserID
+
+data ErrorType = InvalidPort
+               | NoUser
+               | HiddenUser
+               | UnknownError
+               | ErrorToken String
+
+data OpsysField = OpsysField Opsys (Maybe Charset)
+
+data Opsys = Other
+           | Unix
+           | Token String
+
+data Charset = USAscii
+
+data UserID = UserID String
+
+-- | Parse a port pair request
+parsePortPair :: BS.ByteString -> Maybe PortPair
+parsePortPair req =
+  case (fmap fst . BSC.readInt) <$> (BSC.split ',' req) of
+    [p1,p2] -> PortPair <$> p1 <*> p2
+    _ -> Nothing
+
+-- | Render a reply for a given request
+renderReply :: Reply -> ByteString
+renderReply (ReplyError portPair errType) =
+  BSL.toStrict . toLazyByteString $
+       renderPortPair portPair
+    <> string7 " : ERROR : "
+    <> renderErrorType errType
+renderReply (ReplyIdent portPair opsysField userID) =
+  BSL.toStrict . toLazyByteString $
+       renderPortPair portPair 
+    <> string7 " : USERID : "
+    <> renderOpsysField opsysField
+    <> string7 " : "
+    <> renderUserId userID
+
+renderPortPair :: PortPair -> Builder
+renderPortPair (PortPair i j) =
+     intDec i
+  <> string7 ", "
+  <> intDec j
+
+renderErrorType :: ErrorType -> Builder
+renderErrorType InvalidPort = string7 "INVALID-PORT"
+renderErrorType NoUser = string7 "NO-USER"
+renderErrorType HiddenUser = string7 "HIDDEN-USER"
+renderErrorType UnknownError = string7 "UNKNOWN-ERROR"
+renderErrorType (ErrorToken err) =
+  string7 err
+
+renderOpsysField :: OpsysField -> Builder
+renderOpsysField (OpsysField opsys charset) =
+     renderOpsys opsys
+  <> renderCharset charset
+
+renderUserId :: UserID -> Builder
+renderUserId (UserID userID) = string7 userID
+
+renderOpsys :: Opsys -> Builder
+renderOpsys Other = string7 "OTHER"
+renderOpsys Unix = string7 "UNIX"
+renderOpsys (Token tok) = string7 tok
+
+renderCharset :: Maybe Charset -> Builder
+renderCharset Nothing = mempty
+renderCharset _ = error "Charset not supported"