diff --git a/smf/smf.yaml b/smf/smf.yaml
index b51681a..6a8a88f 100644
--- a/smf/smf.yaml
+++ b/smf/smf.yaml
@@ -18,13 +18,13 @@ smf:
       - addr: 192.168.100.1/24
         dnn: internet
         dev: ogstun
-      - addr: fd84:6aea:c36e:2b69::1/48
+      - addr: 2001:230:cafe::1/48
         dev: ogstun
         dnn: internet
       - addr: 192.168.101.1/24
         dnn: ims
         dev: ogstun2
-      - addr: fd1f:76f3:da9b:0101::1/48
+      - addr: 2001:230:babe::1/48
         dnn: ims
         dev: ogstun2
     dns:
diff --git a/upf/tun_if.py b/upf/tun_if.py
index 57733db..808871e 100755
--- a/upf/tun_if.py
+++ b/upf/tun_if.py
@@ -31,7 +31,7 @@ import ipaddress
 """
 Usage in command line:
 e.g:
-$ python3 tun_if.py --tun_ifname ogstun --ipv4_range 192.168.100.0/24 --ipv6_range fd84:6aea:c36e:2b69::/48
+$ python3 tun_if.py --tun_ifname ogstun --ipv4_range 192.168.100.0/24 --ipv6_range 2001:230:cafe::/48
 """
 
 def validate_ip_net(ctx, param, value):
@@ -52,7 +52,7 @@ def validate_ip_net(ctx, param, value):
 @click.option('--ipv6_range',
 			required=True,
 			callback=validate_ip_net,
-			help='UE IPv6 Address range in CIDR format e.g. fd84:6aea:c36e:2b69::/48')
+			help='UE IPv6 Address range in CIDR format e.g. 2001:230:cafe::/48')
 @click.option('--nat_rule',
 			default='yes',
 			help='Option specifying whether to add NATing iptables rule or not')
diff --git a/upf/upf.yaml b/upf/upf.yaml
index 65b3a33..1899923 100644
--- a/upf/upf.yaml
+++ b/upf/upf.yaml
@@ -13,13 +13,13 @@ upf:
       - addr: 192.168.100.1/24
         dev: ogstun
         dnn: internet
-      - addr: fd84:6aea:c36e:2b69::1/48
+      - addr: 2001:230:cafe::1/48
         dev: ogstun
         dnn: internet
       - addr: 192.168.101.1/24
         dnn: ims
         dev: ogstun2
-      - addr: fd1f:76f3:da9b:0101::1/48
+      - addr: 2001:230:babe::1/48
         dnn: ims
         dev: ogstun2
 
diff --git a/upf/upf_init.sh b/upf/upf_init.sh
index 5db0a54..80bd02d 100755
--- a/upf/upf_init.sh
+++ b/upf/upf_init.sh
@@ -31,8 +31,8 @@ export LANG=C.UTF-8
 export IP_ADDR=$(awk 'END{print $1}' /etc/hosts)
 export IF_NAME=$(ip r | awk '/default/ { print $5 }')
 
-python3 /mnt/upf/tun_if.py --tun_ifname ogstun --ipv4_range 192.168.100.0/24 --ipv6_range fd84:6aea:c36e:2b69::/48
-python3 /mnt/upf/tun_if.py --tun_ifname ogstun2 --ipv4_range 192.168.101.0/24 --ipv6_range fd1f:76f3:da9b:0101::/48 --nat_rule 'no'
+python3 /mnt/upf/tun_if.py --tun_ifname ogstun --ipv4_range 192.168.100.0/24 --ipv6_range 2001:230:cafe::/48
+python3 /mnt/upf/tun_if.py --tun_ifname ogstun2 --ipv4_range 192.168.101.0/24 --ipv6_range 2001:230:babe::/48 --nat_rule 'no'
 
 cp /mnt/upf/upf.yaml install/etc/open5gs
 sed -i 's|UPF_IP|'$UPF_IP'|g' install/etc/open5gs/upf.yaml