diff --git a/etc/db.ocf b/etc/db.ocf
index 5044a3e..c9ac352 100644
--- a/etc/db.ocf
+++ b/etc/db.ocf
@@ -10,7 +10,7 @@
 
 ; ns.ocf is master server and hostmaster@ocf is technical contact
 @ IN SOA ns.ocf.berkeley.edu. hostmaster.ocf.berkeley.edu. (
-2026072002 ; serial number
+2026082800 ; serial number
                          1d         ; slave refresh schedule interval
                          30m        ; slave retry on failure interval
                          4w         ; slave expiration of zone data
@@ -91,17 +91,14 @@ scurvy-mgmt	IN CNAME	yuu-mgmt
 ; dataloss-mgmt (ipmi)
 dataloss-mgmt	IN A	169.229.226.5
 
-; dataloss (server)
-_acme-challenge.dataloss	IN CNAME	_acme-challenge.dataloss.letsencrypt.ocf.io.
-dataloss	IN A	169.229.226.6
-dataloss	IN AAAA	2607:f140:8801::1:6
-
 ; kobudai (server)
 _acme-challenge.kobudai	IN CNAME	_acme-challenge.kobudai.letsencrypt.ocf.io.
 kobudai	IN A	169.229.226.6
 kobudai	IN AAAA	2607:f140:8801::1:6
 _acme-challenge.filehost	IN CNAME	_acme-challenge.filehost.letsencrypt.ocf.io.
 filehost	IN CNAME	kobudai
+_acme-challenge.dataloss	IN CNAME	_acme-challenge.dataloss.letsencrypt.ocf.io.
+dataloss	IN CNAME	kobudai
 _acme-challenge.homes	IN CNAME	_acme-challenge.homes.letsencrypt.ocf.io.
 homes	IN CNAME	kobudai
 _acme-challenge.services	IN CNAME	_acme-challenge.services.letsencrypt.ocf.io.
diff --git a/etc/serial b/etc/serial
index 852b59c..0749a33 100644
--- a/etc/serial
+++ b/etc/serial
@@ -1 +1 @@
-2026072002
+2026082800
diff --git a/etc/zones/db.0.0.0.0.1.0.8.8.0.4.1.f.7.0.6.2.ip6.arpa b/etc/zones/db.0.0.0.0.1.0.8.8.0.4.1.f.7.0.6.2.ip6.arpa
index e2cd257..7d55d07 100644
--- a/etc/zones/db.0.0.0.0.1.0.8.8.0.4.1.f.7.0.6.2.ip6.arpa
+++ b/etc/zones/db.0.0.0.0.1.0.8.8.0.4.1.f.7.0.6.2.ip6.arpa
@@ -12,7 +12,7 @@ $ORIGIN 0.0.0.0.1.0.8.8.0.4.1.f.7.0.6.2.ip6.arpa.
 $TTL 1d
 
 @ IN SOA ns.ocf.berkeley.edu. hostmaster.ocf.berkeley.edu. (
-2026072002 ; serial number
+2026082800 ; serial number
                          1d         ; slave refresh schedule interval
                          30m        ; slave retry on failure interval
                          4w         ; slave expiration of zone data
@@ -33,7 +33,6 @@ $ORIGIN 1.0.0.0.0.0.0.0.0.0.0.0
 2.7.0.0 IN PTR segfault.ocf.berkeley.edu.
 2.0.0.0 IN PTR blackhole.ocf.berkeley.edu.
 3.0.0.0 IN PTR yuu.ocf.berkeley.edu.
-6.0.0.0 IN PTR dataloss.ocf.berkeley.edu.
 6.0.0.0 IN PTR kobudai.ocf.berkeley.edu.
 7.0.0.0 IN PTR adenine.ocf.berkeley.edu.
 8.0.0.0 IN PTR guanine.ocf.berkeley.edu.
diff --git a/etc/zones/db.226.229.169.in-addr.arpa b/etc/zones/db.226.229.169.in-addr.arpa
index d357a55..ad46627 100644
--- a/etc/zones/db.226.229.169.in-addr.arpa
+++ b/etc/zones/db.226.229.169.in-addr.arpa
@@ -12,7 +12,7 @@ $ORIGIN 226.229.169.in-addr.arpa.
 $TTL 1d
 
 @ IN SOA ns.ocf.berkeley.edu. hostmaster.ocf.berkeley.edu. (
-2026072002 ; serial number
+2026082800 ; serial number
                          1d         ; slave refresh schedule interval
                          30m        ; slave retry on failure interval
                          4w         ; slave expiration of zone data
@@ -33,7 +33,6 @@ $TTL 1d
 3 IN PTR yuu.OCF.Berkeley.EDU.
 4 IN PTR yuu-mgmt.OCF.Berkeley.EDU.
 5 IN PTR dataloss-mgmt.OCF.Berkeley.EDU.
-6 IN PTR dataloss.OCF.Berkeley.EDU.
 6 IN PTR kobudai.OCF.Berkeley.EDU.
 7 IN PTR adenine.OCF.Berkeley.EDU.
 8 IN PTR guanine.OCF.Berkeley.EDU.