`mail.learnforge.de`

DNSSEC	⚠️ Not signed
A	2a01:4f8:c014:db47::1^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
		PTR	`mail.learnforge.de`
A	91.99.13.137^{🇩🇪 Hetzner91.99.0.0/16 HETZNER-DC}
TXT	`v=spf1 a -all`

`learnforge.de`

	DNSSEC	⚠️ Not signed
	A	91.99.13.137^{🇩🇪 Hetzner91.99.0.0/16 HETZNER-DC}
	NS	`hydrogen.ns.hetzner.com` ⭐
	NS	`helium.ns.hetzner.de`
	NS	`oxygen.ns.hetzner.com`
	MX	`mail.learnforge.de` ⭐
	TXT	`v=spf1 ip4:91.99.13.137 mx ~all`
	SOA	`hydrogen.ns.hetzner.com`dns@hetzner.com 2026-02-05 #0

PTR for

1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.4.b.d.4.1.0.c.8.f.4.0.1.0.a.2.ip6.arpa

137.13.99.91.in-addr.arpa

MX for

stoeffer.de

learnforge.de

Previously MX for

learnforge.org

Same first word

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DNS History

3 records (2 active, 1 former)

●A2a01:4f8:c014:db47::12026-03-24 → 2026-03-24 · 3 obs

○ 2016-07-20 17:27:46
● 2026-03-24 11:20:24
● 2026-03-24 14:45:00

○A78.46.125.892015-07-10 → 2016-07-20 · 4 obs

● 2015-07-10 00:49:30
● 2016-07-20 17:27:46
○ 2026-03-24 11:20:24
○ 2026-03-24 14:45:00

●A91.99.13.1372026-03-24 → 2026-03-24 · 3 obs

○ 2016-07-20 17:27:46
● 2026-03-24 11:20:24
● 2026-03-24 14:45:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
learnforge.de	hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com, helium.ns.hetzner.de	-

✅ Authoritative Response

Server:213.133.100.98

NS records: hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com, helium.ns.hetzner.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for learnforge.de (unsigned zone)

⏱️ Timing

Total: 822ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`91.99.13.137`
AAAA	1	`2a01:4f8:c014:db47::1`
TXT	1	`v=spf1 a -all`

Analysis

Mail Server Role

mail.learnforge.de serves mail for stoeffer.de and learnforge.de.

IP Addresses

mail.learnforge.de points to two IPs: 2a01:4f8:c014:db47::1 and 91.99.13.137.

Other host names such as learnforge.de, static.137.13.99.91.clients.your-server.de and relay-in6.yukthi.net share IP numbers with mail.learnforge.de.

mail.learnforge.de - robtex.com