diff --git a/lib/net/hostlist.js b/lib/net/hostlist.js
index 8e035e16..6e2a8dbe 100644
--- a/lib/net/hostlist.js
+++ b/lib/net/hostlist.js
@@ -280,6 +280,7 @@ HostList.prototype.add = function add(addr, src) {
 
     // Update services.
     entry.addr.services |= addr.services;
+    entry.addr.services >>>= 0;
 
     // Online?
     if (now - addr.ts < 24 * 60 * 60)
@@ -509,6 +510,8 @@ HostList.prototype.markAck = function markAck(hostname, services) {
     return;
 
   entry.addr.services |= services;
+  entry.addr.services >>>= 0;
+
   entry.lastSuccess = now;
   entry.lastAttempt = now;
   entry.attempts = 0;
@@ -1025,12 +1028,14 @@ HostEntry.prototype.fromJSON = function fromJSON(json, network) {
   if (json.services != null) {
     assert(typeof json.services === 'string');
     assert(json.services.length > 0);
-    assert(json.services.length < 64);
+    assert(json.services.length <= 32);
     this.addr.services = parseInt(json.services, 2);
+    assert(util.isUInt32(this.addr.services));
   }
 
   if (json.ts != null) {
     assert(util.isNumber(json.ts));
+    assert(json.ts >= 0);
     this.addr.ts = json.ts;
   }
 
@@ -1041,16 +1046,19 @@ HostEntry.prototype.fromJSON = function fromJSON(json, network) {
 
   if (json.attempts != null) {
     assert(util.isNumber(json.attempts));
+    assert(json.attempts >= 0);
     this.attempts = json.attempts;
   }
 
   if (json.lastSuccess != null) {
     assert(util.isNumber(json.lastSuccess));
+    assert(json.lastSuccess >= 0);
     this.lastSuccess = json.lastSuccess;
   }
 
   if (json.lastAttempt != null) {
     assert(util.isNumber(json.lastAttempt));
+    assert(json.lastAttempt >= 0);
     this.lastAttempt = json.lastAttempt;
   }
 
diff --git a/lib/net/packets.js b/lib/net/packets.js
index f2c3132f..1fbabf4f 100644
--- a/lib/net/packets.js
+++ b/lib/net/packets.js
@@ -250,7 +250,8 @@ VersionPacket.prototype.getSize = function getSize() {
 
 VersionPacket.prototype.toWriter = function toWriter(bw) {
   bw.write32(this.version);
-  bw.writeU64(this.services);
+  bw.writeU32(this.services);
+  bw.writeU32(0);
   bw.write64(this.ts);
   this.recv.toWriter(bw, false);
   this.from.toWriter(bw, false);
@@ -344,7 +345,12 @@ VersionPacket.prototype.hasCompact = function hasCompact() {
 
 VersionPacket.prototype.fromReader = function fromReader(br) {
   this.version = br.read32();
-  this.services = br.readU53();
+  this.services = br.readU32();
+
+  // Note: hi service bits
+  // are currently unused.
+  br.readU32();
+
   this.ts = br.read53();
   this.recv.fromReader(br, false);
 
diff --git a/lib/primitives/netaddress.js b/lib/primitives/netaddress.js
index 648f3fd1..47a4bb8c 100644
--- a/lib/primitives/netaddress.js
+++ b/lib/primitives/netaddress.js
@@ -302,10 +302,16 @@ NetAddress.fromSocket = function fromSocket(hostname, network) {
 
 NetAddress.prototype.fromReader = function fromReader(br, full) {
   this.ts = full ? br.readU32() : 0;
-  this.services = br.readU53();
+  this.services = br.readU32();
+
+  // Note: hi service bits
+  // are currently unused.
+  br.readU32();
+
   this.host = IP.toString(br.readBytes(16, true));
   this.port = br.readU16BE();
   this.hostname = IP.hostname(this.host, this.port);
+
   return this;
 };
 
@@ -353,7 +359,8 @@ NetAddress.prototype.toWriter = function toWriter(bw, full) {
   if (full)
     bw.writeU32(this.ts);
 
-  bw.writeU64(this.services);
+  bw.writeU32(this.services);
+  bw.writeU32(0);
   bw.writeBytes(IP.toBuffer(this.host));
   bw.writeU16BE(this.port);