diff --git a/src/rfc1035.c b/src/rfc1035.c
index 9cdc2a6..7f175ab 100644
--- a/src/rfc1035.c
+++ b/src/rfc1035.c
@@ -415,6 +415,7 @@ int private_net(struct in_addr addr, int ban_localhost)
     (((ip_addr & 0xFF000000) == 0x7F000000) && ban_localhost)  /* 127.0.0.0/8    (loopback) */ ||
     (((ip_addr & 0xFF000000) == 0x00000000) && ban_localhost) /* RFC 5735 section 3. "here" network */ ||
     ((ip_addr & 0xFF000000) == 0x0A000000)  /* 10.0.0.0/8     (private)  */ ||
+    ((ip_addr & 0xFFC00000) == 0x64400000)  /* 100.64.0.0/10  (CG-NAT) RFC6598/RFC7793*/ ||
     ((ip_addr & 0xFFF00000) == 0xAC100000)  /* 172.16.0.0/12  (private)  */ ||
     ((ip_addr & 0xFFFF0000) == 0xC0A80000)  /* 192.168.0.0/16 (private)  */ ||
     ((ip_addr & 0xFFFF0000) == 0xA9FE0000)  /* 169.254.0.0/16 (zeroconf) */ ||