diff --git a/Cargo.toml b/Cargo.toml
index 29bf08c..a634e43 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "kbinxml"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Matt Bilker <me@mbilker.us>"]
 
 [dependencies]
diff --git a/src/bin/kbinxml.rs b/src/bin/kbinxml.rs
index 7244281..a873cef 100644
--- a/src/bin/kbinxml.rs
+++ b/src/bin/kbinxml.rs
@@ -11,10 +11,11 @@ extern crate quick_xml;
 use std::env;
 use std::fs::File;
 use std::io::{Cursor, Error as IoError, ErrorKind as IoErrorKind, Read, Write, stdout};
+use std::net::Ipv4Addr;
 use std::str;
 
 use failure::Fail;
-use kbinxml::{KbinXml, Options, from_bytes, to_bytes};
+use kbinxml::{Ip4Addr, KbinXml, Options, from_bytes, to_bytes};
 use minidom::Element;
 use quick_xml::Writer;
 
@@ -24,6 +25,9 @@ pub struct Testing2 {
   hi: u16,
   ho: i16,
   vu: Vec<u8>,
+  opt: Option<u8>,
+  opt2: Option<u8>,
+  ip: Ip4Addr,
 }
 
 #[derive(Debug, Deserialize, Serialize)]
@@ -154,6 +158,9 @@ fn main() -> std::io::Result<()> {
         hi: 32423,
         ho: 32000,
         vu: vec![33, 255, 254],
+        opt: None,
+        opt2: Some(111),
+        ip: Ip4Addr::new(Ipv4Addr::new(127, 0, 0, 1)),
       },
     };
     let bytes = to_bytes(&obj).unwrap();
diff --git a/src/ip4.rs b/src/ip4.rs
new file mode 100644
index 0000000..ae77194
--- /dev/null
+++ b/src/ip4.rs
@@ -0,0 +1,87 @@
+use std::fmt;
+use std::net::Ipv4Addr;
+use std::ops::{Deref, DerefMut};
+
+use serde::de::{Deserialize, Deserializer, SeqAccess, Visitor};
+use serde::ser::{Serialize, SerializeTupleStruct, Serializer};
+
+pub struct Ip4Addr(Ipv4Addr);
+
+struct Ip4Visitor;
+
+impl Ip4Addr {
+  pub fn new(addr: Ipv4Addr) -> Self {
+    Ip4Addr(addr)
+  }
+}
+
+impl fmt::Display for Ip4Addr {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fmt::Display::fmt(&self.0, f)
+  }
+}
+
+impl fmt::Debug for Ip4Addr {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fmt::Debug::fmt(&self.0, f)
+  }
+}
+
+impl Deref for Ip4Addr {
+  type Target = Ipv4Addr;
+
+  fn deref(&self) -> &Self::Target {
+    &self.0
+  }
+}
+
+impl DerefMut for Ip4Addr {
+  fn deref_mut(&mut self) -> &mut Self::Target {
+    &mut self.0
+  }
+}
+
+impl<'de> Visitor<'de> for Ip4Visitor {
+  type Value = [u8; 4];
+
+  fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    f.write_str("a sequence of 4 bytes with no size indicator")
+  }
+
+  fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+    where A: SeqAccess<'de>
+  {
+    trace!("Ip4Addr::visit_seq()");
+    let v1: u8 = seq.next_element()?.unwrap();
+    let v2: u8 = seq.next_element()?.unwrap();
+    let v3: u8 = seq.next_element()?.unwrap();
+    let v4: u8 = seq.next_element()?.unwrap();
+    trace!("Ip4Addr:visit_seq() => [{}, {}, {}, {}]", v1, v2, v3, v4);
+    Ok([v1, v2, v3, v4])
+  }
+}
+
+impl<'de> Deserialize<'de> for Ip4Addr {
+  fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where D: Deserializer<'de>
+  {
+    deserializer.deserialize_tuple_struct("ip4", 4, Ip4Visitor)
+      .map(|v| {
+        Ip4Addr(Ipv4Addr::from(v))
+      })
+  }
+}
+
+impl Serialize for Ip4Addr {
+  fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where S: Serializer
+  {
+    let octets = self.0.octets();
+    let mut ts = serializer.serialize_tuple_struct("ip4", 4)?;
+    ts.serialize_field(&octets[0])?;
+    ts.serialize_field(&octets[1])?;
+    ts.serialize_field(&octets[2])?;
+    ts.serialize_field(&octets[3])?;
+    ts.end()
+  }
+}
diff --git a/src/lib.rs b/src/lib.rs
index c288cac..bcdf501 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -26,6 +26,7 @@ mod byte_buffer;
 mod compression;
 mod encoding_type;
 mod error;
+mod ip4;
 mod node_types;
 mod options;
 mod sixbit;
@@ -43,6 +44,7 @@ pub use encoding_type::EncodingType;
 pub use error::{KbinError, KbinErrorKind, Result};
 pub use options::Options;
 pub use de::from_bytes;
+pub use ip4::Ip4Addr;
 pub use ser::to_bytes;
 
 const SIGNATURE: u8 = 0xA0;