diff --git a/nmap-os-db b/nmap-os-db
index c3ac55ce3..3c5095f44 100644
--- a/nmap-os-db
+++ b/nmap-os-db
@@ -21919,6 +21919,23 @@ T7(R=Y%DF=Y%T=3B-45%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)
 U1(DF=N%T=3B-45%TG=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)
 IE(DFI=N%T=3B-45%TG=40%CD=S)
 
+# Linux 2.6.18-164.11.1.el5xen #1 SMP Wed Jan 20 08:06:04 EST 2010 x86_64 x86_64 x86_64 GNU/Linux
+Fingerprint Linux 2.6.18 (CentOS 5.4)
+Class Linux | Linux | 2.6.X | general purpose
+SEQ(SP=C0-D2%GCD=1-6%ISR=C5-DB%TI=Z%CI=Z%II=I%TS=8)
+OPS(O1=M5ACST11NW7%O2=M5ACST11NW7%O3=M5ACNNT11NW7%O4=M5ACST11NW7%O5=M5ACST11NW7%O6=M5ACST11)
+WIN(W1=16A0%W2=16A0%W3=16A0%W4=16A0%W5=16A0%W6=16A0)
+ECN(R=Y%DF=Y%T=3B-45%TG=40%W=16D0%O=M5ACNNSNW7%CC=N%Q=)
+T1(R=Y%DF=Y%T=3B-45%TG=40%S=O%A=S+%F=AS%RD=0%Q=)
+T2(R=N)
+T3(R=Y%DF=Y%T=3B-45%TG=40%W=16A0%S=O%A=S+%F=AS%O=M5ACST11NW7%RD=0%Q=)
+T4(R=Y%DF=Y%T=3B-45%TG=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)
+T5(R=Y%DF=Y%T=3B-45%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)
+T6(R=Y%DF=Y%T=3B-45%TG=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)
+T7(R=Y%DF=Y%T=3B-45%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)
+U1(DF=N%T=3B-45%TG=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)
+IE(DFI=N%T=3B-45%TG=40%CD=S)
+
 # Linux router 2.4.35.4 #3 Wed Sep 17 05:23:42 CDT 2008 mips unknown (X-WRT snapshot on Asus WL-500W)
 # Linux OpenWrt 2.4.35.4 #3 Mon Oct 27 16:30:43 EDT 2008 mips unknown (Asus wl520gu, running OpenWrt, Kamikaze 'bleeding edge' r13053)
 # Linux 2.4.35.4 #6 Thu Dec 4 11:20:50 HKT 2008 mips unknown, openwrt 8.09 branch r13497
@@ -24127,7 +24144,7 @@ IE(DFI=N%T=3B-45%TG=40%CD=S)
 # Linux 2.6.20-1 (Fedora Core 5)
 Fingerprint Linux 2.6.20-1 (Fedora Core 5)
 Class Linux | Linux | 2.6.X | general purpose
-SEQ(SP=BD-CD%GCD=1-6%ISR=C7-D5%TI=Z%II=I%TS=A)
+SEQ(SP=BD-CD%GCD=1-6%ISR=C7-D7%TI=Z%II=I%TS=A)
 OPS(O1=M5ACST11NW7%O2=M5ACST11NW7%O3=M5ACNNT11NW7%O4=M5ACST11NW7%O5=M5ACST11NW7%O6=M5ACST11)
 WIN(W1=16A0%W2=16A0%W3=16A0%W4=16A0%W5=16A0%W6=16A0)
 ECN(R=Y%DF=Y%T=3B-45%TG=40%W=16D0%O=M5ACNNSNW7%CC=N%Q=)