diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index 2637b80a..092ec3ea 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -244,10 +244,32 @@ Peer.prototype._init = function init() {
 
   // Say hello.
   this.write(this.framer.version({
+    version: constants.VERSION,
+    services: constants.LOCAL_SERVICES,
+    ts: bcoin.now(),
+    remote: {},
+    local: {
+      services: constants.LOCAL_SERVICES,
+      host: this.pool.host,
+      port: this.pool.port
+    },
+    nonce: this.pool.localNonce,
+    agent: constants.USER_AGENT,
     height: this.chain.height,
     relay: this.options.relay,
-    nonce: this.pool.localNonce
   }));
+
+  // Advertise our address.
+  if (this.pool.host !== '0.0.0.0'
+      && !this.pool.options.selfish
+      && this.pool.server) {
+    this.write(this.framer.addr([{
+      ts: utils.now() - (process.uptime() | 0),
+      services: constants.LOCAL_SERVICES,
+      host: this.pool.host,
+      port: this.pool.port
+    }]));
+  }
 };
 
 /**
@@ -1302,26 +1324,23 @@ Peer.prototype._handleGetData = function handleGetData(items) {
 
 Peer.prototype._handleAddr = function handleAddr(addrs) {
   var now = utils.now();
-  var i, addr, ts, host;
+  var i, addr, ts;
 
   for (i = 0; i < addrs.length; i++) {
     addr = addrs[i];
 
     ts = addr.ts;
-    host = addr.ipv4 !== '0.0.0.0'
-      ? addr.ipv4
-      : addr.ipv6;
 
     if (ts <= 100000000 || ts > now + 10 * 60)
       ts = now - 5 * 24 * 60 * 60;
 
-    this.addrFilter.add(host, 'ascii');
+    this.addrFilter.add(addr.host, 'ascii');
 
     this.emit('addr', {
       version: addr.version,
       ts: ts,
       services: addr.services,
-      host: host,
+      host: addr.host,
       port: addr.port || this.network.port
     });
   }
@@ -1375,7 +1394,7 @@ Peer.prototype._handleGetAddr = function handleGetAddr() {
   var hosts = {};
   var items = [];
   var ts = utils.now() - (process.uptime() | 0);
-  var i, seed, version, peer;
+  var i, seed, peer;
 
   if (this.pool.options.selfish)
     return;
@@ -1383,9 +1402,8 @@ Peer.prototype._handleGetAddr = function handleGetAddr() {
   for (i = 0; i < this.pool.seeds.length; i++) {
     seed = utils.parseHost(this.pool.seeds[i]);
     seed = this.pool.getPeer(seed.host) || seed;
-    version = utils.isIP(seed.host);
 
-    if (!version)
+    if (!utils.isIP(seed.host))
       continue;
 
     if (hosts[seed.host])
@@ -1397,11 +1415,9 @@ Peer.prototype._handleGetAddr = function handleGetAddr() {
       continue;
 
     items.push({
-      network: this.network,
       ts: seed.ts || ts,
-      services: seed.version ? seed.version.services : null,
-      ipv4: version === 4 ? seed.host : null,
-      ipv6: version === 6 ? seed.host : null,
+      services: seed.version ? seed.version.services : 0,
+      host: seed.host,
       port: seed.port || this.network.port
     });
 
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index d69111e1..4ea9e04e 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -108,6 +108,8 @@ function Pool(options) {
   this.seeds = [];
   this.hosts = {};
   this.setSeeds([]);
+  this.host = '0.0.0.0';
+  this.port = this.network.port;
 
   this.server = null;
   this.destroyed = false;
@@ -194,20 +196,7 @@ function Pool(options) {
     interval: options.invInterval || 3000
   };
 
-  function done(err) {
-    if (err)
-      return self.emit('error', err);
-
-    self.loaded = true;
-    self.emit('open');
-
-    self._init();
-  }
-
-  if (this.mempool)
-    this.mempool.open(done);
-  else
-    this.chain.open(done);
+  this._init();
 }
 
 utils.inherits(Pool, EventEmitter);
@@ -316,6 +305,29 @@ Pool.prototype._init = function _init() {
     self.emit('full');
     bcoin.debug('Chain is fully synced (height=%d).', self.chain.height);
   });
+
+  function done(err) {
+    if (err)
+      return self.emit('error', err);
+
+    self.loaded = true;
+    self.emit('open');
+  }
+
+  this.getIP(function(err, ip) {
+    if (err)
+      bcoin.error(err);
+
+    if (ip) {
+      self.host = ip;
+      bcoin.debug('External IP found: %s.', ip);
+    }
+
+    if (self.mempool)
+      self.mempool.open(done);
+    else
+      self.chain.open(done);
+  });
 };
 
 /**
@@ -2088,6 +2100,62 @@ Pool.prototype.reject = function reject(peer, obj, code, reason, score) {
     peer.setMisbehavior(score);
 };
 
+/**
+ * Attempt to retrieve external IP from icanhazip.com.
+ * @param {Function} callback
+ */
+
+Pool.prototype.getIP = function getIP(callback) {
+  var self = this;
+  var request = require('./http/request');
+  var ip;
+
+  if (utils.isBrowser)
+    return callback(new Error('Could not find IP.'));
+
+  request({
+    method: 'GET',
+    uri: 'http://icanhazip.com',
+    expect: 'text'
+  }, function(err, res, body) {
+    if (err)
+      return self.getIP2(callback);
+
+    ip = body.trim();
+
+    if (!utils.isIP(ip))
+      return self.getIP2(callback);
+
+    return callback(null, ip);
+  });
+};
+
+/**
+ * Attempt to retrieve external IP from dyndns.org.
+ * @param {Function} callback
+ */
+
+Pool.prototype.getIP2 = function getIP2(callback) {
+  var request = require('./http/request');
+  var ip;
+
+  request({
+    method: 'GET',
+    uri: 'http://checkip.dyndns.org',
+    expect: 'html'
+  }, function(err, res, body) {
+    if (err)
+      return callback(err);
+
+    ip = /IP Address:\s*([0-9.:]+)/i.exec(body);
+
+    if (!ip || !utils.isIP(ip[1]))
+      return callback(new Error('Could not find IP.'));
+
+    return callback(null, ip[1]);
+  });
+};
+
 /**
  * Represents an in-flight block or transaction.
  * @exports LoadRequest
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index d6539b11..a238b7a4 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -17,8 +17,6 @@ var DUMMY = new Buffer([]);
  * @exports Framer
  * @constructor
  * @param {Object} options
- * @param {String} options.USER_AGENT - User agent string.
- * @property {Buffer} agent
  */
 
 function Framer(options) {
@@ -30,8 +28,6 @@ function Framer(options) {
 
   this.options = options;
   this.network = bcoin.network.get(options.network);
-
-  this.agent = options.agent || constants.USER_AGENT;
 }
 
 /**
@@ -94,12 +90,6 @@ Framer.prototype.packet = function packet(cmd, payload, checksum) {
  */
 
 Framer.prototype.version = function version(options) {
-  if (!options)
-    options = {};
-
-  options.agent = this.agent;
-  options.network = this.network;
-
   return this.packet('version', Framer.version(options));
 };
 
@@ -409,7 +399,8 @@ Framer.prototype.addr = function addr(peers) {
  */
 
 Framer.prototype.alert = function alert(options) {
-  return this.packet('alert', Framer.alert(options, this.network));
+  options.network = this.network;
+  return this.packet('alert', Framer.alert(options));
 };
 
 /**
@@ -432,7 +423,6 @@ Framer.prototype.feeFilter = function feeFilter(options) {
 
 Framer.address = function address(data, full, writer) {
   var p = new BufferWriter(writer);
-  var network = bcoin.network.get(data.network);
 
   if (full) {
     if (!data.ts)
@@ -442,22 +432,8 @@ Framer.address = function address(data, full, writer) {
   }
 
   p.writeU64(data.services || 0);
-
-  if (data.ipv6) {
-    p.writeBytes(utils.ip2array(data.ipv6, 6));
-  } else {
-    // We don't have an ipv6 address: convert
-    // ipv4 to ipv4-mapped ipv6 address.
-    p.writeU32BE(0x00000000);
-    p.writeU32BE(0x00000000);
-    p.writeU32BE(0x0000ffff);
-    if (data.ipv4)
-      p.writeBytes(utils.ip2array(data.ipv4, 4));
-    else
-      p.writeU32BE(0x00000000);
-  }
-
-  p.writeU16BE(data.port || network.port);
+  p.writeBytes(utils.ip2array(data.host));
+  p.writeU16BE(data.port || 0);
 
   if (!writer)
     p = p.render();
@@ -475,15 +451,13 @@ Framer.address = function address(data, full, writer) {
 Framer.version = function version(options, writer) {
   var p = new BufferWriter(writer);
   var agent = options.agent || constants.USER_AGENT;
+  var services = options.services;
   var remote = options.remote || {};
   var local = options.local || {};
   var nonce = options.nonce;
 
-  if (local.network == null)
-    local.network = options.network;
-
-  if (remote.network == null)
-    remote.network = options.network;
+  if (services == null)
+    services = constants.LOCAL_SERVICES;
 
   if (local.services == null)
     local.services = constants.LOCAL_SERVICES;
@@ -491,9 +465,9 @@ Framer.version = function version(options, writer) {
   if (!nonce)
     nonce = utils.nonce();
 
-  p.write32(constants.VERSION);
-  p.writeU64(constants.LOCAL_SERVICES);
-  p.write64(utils.now());
+  p.write32(options.version || constants.VERSION);
+  p.writeU64(services);
+  p.write64(options.ts || bcoin.now());
   Framer.address(remote, false, p);
   Framer.address(local, false, p);
   p.writeU64(nonce);
@@ -1189,28 +1163,19 @@ Framer.reject = function reject(details, writer) {
 
 /**
  * Create an addr packet (without a header).
- * @param {InvItem[]} peers
+ * @param {NetworkAddress[]} hosts
  * @param {BufferWriter?} writer - A buffer writer to continue writing from.
  * @returns {Buffer} Returns a BufferWriter if `writer` was passed in.
  */
 
-Framer.addr = function addr(peers, writer) {
+Framer.addr = function addr(hosts, writer) {
   var p = new BufferWriter(writer);
-  var i, peer;
+  var i;
 
-  p.writeVarint(peers.length);
+  p.writeVarint(hosts.length);
 
-  for (i = 0; i < peers.length; i++) {
-    peer = peers[i];
-    Framer.address({
-      network: peer.network,
-      ts: peer.ts,
-      services: peer.services,
-      ipv6: peer.ipv6,
-      ipv4: peer.ipv4,
-      port: peer.port
-    }, true, p);
-  }
+  for (i = 0; i < hosts.length; i++)
+    Framer.address(hosts[i], true, p);
 
   if (!writer)
     p = p.render();
@@ -1221,16 +1186,14 @@ Framer.addr = function addr(peers, writer) {
 /**
  * Create an alert packet (without a header).
  * @param {AlertPacket} data
- * @param {Network|NetworkType} network
  * @param {BufferWriter?} writer - A buffer writer to continue writing from.
  * @returns {Buffer} Returns a BufferWriter if `writer` was passed in.
  */
 
-Framer.alert = function alert(data, network, writer) {
-  var p, i, payload;
+Framer.alert = function alert(data, writer) {
+  var network = bcoin.network.get(data.network);
   var key = data.key;
-
-  network = bcoin.network.get(network);
+  var p, i, payload;
 
   if (!key && network.alertPrivateKey)
     key = network.alertPrivateKey;
@@ -1470,7 +1433,7 @@ Framer.filterClear = function filterClear() {
  * @returns {Buffer} Returns a BufferWriter if `writer` was passed in.
  */
 
-Framer.feeFilter = function feeFilter(data, network, writer) {
+Framer.feeFilter = function feeFilter(data, writer) {
   var p = new BufferWriter(writer);
 
   p.write64(data.rate);
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 5c72ab3f..306f6d31 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -1198,8 +1198,7 @@ Parser.parseAddress = function parseAddress(p, full) {
   return {
     ts: ts,
     services: services,
-    ipv6: utils.array2ip(ip, 6),
-    ipv4: utils.array2ip(ip, 4),
+    host: utils.array2ip(ip),
     port: port
   };
 };
diff --git a/lib/bcoin/types.js b/lib/bcoin/types.js
index 0edb9b47..bb76417f 100644
--- a/lib/bcoin/types.js
+++ b/lib/bcoin/types.js
@@ -258,8 +258,7 @@
  * @typedef {Object} NetworkAddress
  * @property {Number?} ts - Timestamp.
  * @property {Number?} services - Service bits.
- * @property {Buffer?} ipv4 - IPv4 address.
- * @property {Buffer?} ipv6 - IPv6 address.
+ * @property {String?} host - IP address (IPv6 or IPv4).
  * @property {Number?} port - Port.
  * @global
  */
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 6674e3bc..cb5f7fde 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -899,159 +899,104 @@ utils.isIP = function isIP(ip) {
 };
 
 /**
- * Cast an IPv6 or IPv4 to IPv4 or IPv6 respectively
- * (if possible using ipv4-mapped ipv6 addresses).
- * @param {Buffer} ip
- * @param {Number} version - 4 or 6.
- * @returns {Buffer} IP address.
+ * Test whether a buffer is an ipv4-mapped ipv6 address.
+ * @returns {Boolean}
  */
 
-utils.ip2version = function ip2version(ip, version) {
-  var b, i, j;
+utils.isMapped = function isMapped(ip, version) {
+  var i;
 
-  assert(Buffer.isBuffer(ip));
-  assert(version === 4 || version === 6, 'Bad IP version.');
+  if (!Buffer.isBuffer(ip))
+    return false;
 
-  if (version === 4) {
-    // Check to see if this an
-    // ipv4-mapped ipv6 address.
-    if (ip.length > 4) {
-      i = 0;
-      while (ip[i] === 0)
-        i++;
-
-      // Found an ipv4 address
-      if (ip.length - i === 6 && ip[i] === 0xff && ip[i + 1] === 0xff)
-        return utils.copy(ip.slice(-4));
-
-      // No ipv4 address
-      return new Buffer([0, 0, 0, 0]);
-    }
-
-    // Pad to 4 bytes
-    if (ip.length < 4) {
-      b = new Buffer(4);
-      i = ip.length;
-      j = b.length;
-      b.fill(0);
-      while (i)
-        b[--j] = ip[--i];
-      ip = b;
-    }
-
-    return ip;
+  for (i = 0; i < ip.length - 6; i++) {
+    if (ip[i] !== 0)
+      return false;
   }
 
-  if (version === 6) {
-    // Pad to 4 bytes
-    if (ip.length < 4) {
-      b = new Buffer(4);
-      i = ip.length;
-      j = b.length;
-      b.fill(0);
-      while (i)
-        b[--j] = ip[--i];
-      ip = b;
-    }
+  if (ip[10] !== 0xff && ip[11] !== 0xff)
+    return false;
 
-    // Try to convert ipv4 address to
-    // ipv4-mapped ipv6 address.
-    if (ip.length === 4) {
-      b = new Buffer(6);
-      i = ip.length;
-      j = b.length;
-      b.fill(0xff);
-      while (i)
-        b[--j] = ip[--i];
-      ip = b;
-    }
-
-    // Pad to 16 bytes
-    if (ip.length < 16) {
-      b = new Buffer(16);
-      i = ip.length;
-      j = b.length;
-      b.fill(0);
-      while (i)
-        b[--j] = ip[--i];
-      ip = b;
-    }
-
-    return ip;
-  }
+  return true;
 };
 
 /**
  * Convert an IP string to a buffer.
  * @param {String} ip
- * @param {Number} version - 4 or 6.
  * @returns {Buffer}
  */
 
-utils.ip2array = function ip2array(ip, version) {
-  var type = utils.isIP(ip);
-  var parts;
+utils.ip2array = function ip2array(ip) {
+  var version, parts, out;
 
-  assert(version === 4 || version === 6, 'Bad IP version.');
-
-  if (type === 0) {
-    if (!Buffer.isBuffer(ip))
-      ip = new Buffer([0, 0, 0, 0]);
-  } else if (type === 4) {
-    parts = ip.split('.');
-    ip = new Buffer(4);
-    ip[0] = +parts[0];
-    ip[1] = +parts[1];
-    ip[2] = +parts[2];
-    ip[3] = +parts[3];
-  } else if (type === 6) {
-    ip = new Buffer(ip.replace(/:/g, ''), 'hex');
-    assert(ip.length <= 16);
+  if (Buffer.isBuffer(ip)) {
+    assert(ip.length === 16);
+    return ip;
   }
 
-  return utils.ip2version(ip, version);
+  version = utils.isIP(ip);
+
+  if (version === 0)
+    return ip2array('0.0.0.0');
+
+  if (version === 4) {
+    parts = ip.split('.');
+    assert(parts.length === 4);
+    out = new Buffer(16);
+    out.fill(0);
+    out[10] = 0xff;
+    out[11] = 0xff;
+    out[12] = +parts[0];
+    out[13] = +parts[1];
+    out[14] = +parts[2];
+    out[15] = +parts[3];
+    return out;
+  }
+
+  if (version === 6) {
+    ip = new Buffer(ip.replace(/:/g, ''), 'hex');
+    assert(ip.length === 16);
+    return ip;
+  }
+
+  assert(false, 'Bad IP.');
 };
 
 /**
  * Convert a buffer to an ip string.
  * @param {Buffer} ip
- * @param {Number} version - 4 or 6.
  * @returns {String}
  */
 
-utils.array2ip = function array2ip(ip, version) {
-  var out, i, hi, lo;
+utils.array2ip = function array2ip(ip) {
+  var i, out, hi, lo;
 
-  if (!Buffer.isBuffer(ip)) {
-    if (utils.isIP(ip))
-      ip = utils.ip2array(ip, version);
-    else
-      ip = new Buffer([0, 0, 0, 0]);
+  if (typeof ip === 'string') {
+    assert(utils.isIP(ip) !== 0);
+    return ip;
   }
 
-  assert(version === 4 || version === 6, 'Bad IP version.');
-  assert(ip.length <= 16);
+  if (!Buffer.isBuffer(ip))
+    return '0.0.0.0';
 
-  ip = utils.ip2version(ip, version);
+  assert(ip.length === 16);
 
-  if (version === 4)
-    return ip[0] + '.' + ip[1] + '.' + ip[2] + '.' + ip[3];
+  if (utils.isMapped(ip))
+    return ip[12] + '.' + ip[13] + '.' + ip[14] + '.' + ip[15];
 
-  if (version === 6) {
-    out = [];
+  out = [];
 
-    for (i = 0; i < ip.length; i += 2) {
-      hi = ip[i].toString(16);
-      if (hi.length < 2)
-        hi = '0' + hi;
-      lo = ip[i + 1].toString(16);
-      if (lo.length < 2)
-        lo = '0' + lo;
-      out.push(hi + lo);
-    }
-
-    return out.join(':');
+  for (i = 0; i < ip.length; i += 2) {
+    hi = ip[i].toString(16);
+    if (hi.length < 2)
+      hi = '0' + hi;
+    lo = ip[i + 1].toString(16);
+    if (lo.length < 2)
+      lo = '0' + lo;
+    out.push(hi + lo);
   }
+
+  return out.join(':');
 };
 
 /**