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DNS Report for rwth-aachen.de

Date Generated: 2024-08-31 21:38:06
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Nameservers

  • dns-1.dfn.de
    • IPv4: 193.174.75.50
    • IPv6: 2001:638:d:b101::1
    • TTL (IPv4): 30 seconds
    • TTL (IPv6): 30 seconds
    • Recursive: N/A
  • zs1.rz.rwth-aachen.de
    • IPv4: 134.130.4.9
    • IPv6: 2a00:8a60:0:4::9
    • TTL (IPv4): 30 seconds
    • TTL (IPv6): 30 seconds
    • Recursive: N/A
  • dns-2.dfn.de
    • IPv4: 193.174.75.54
    • IPv6: 2001:638:d:b102::1
    • TTL (IPv4): 30 seconds
    • TTL (IPv6): 30 seconds
    • Recursive: N/A
  • zs2.rz.rwth-aachen.de
    • IPv4: 134.130.5.9
    • IPv6: 2a00:8a60:0:5::9
    • TTL (IPv4): 30 seconds
    • TTL (IPv6): 30 seconds
    • Recursive: N/A

Nameserver Count - OK

Nameserver Queries

  • dns-1.dfn.de
    • Status: Responded
    • IP(s): 137.226.107.63
    • TTL: 86400 seconds
    • Recursive Queries: Does not allow recursive queries
    • TCP Connectivity: TCP connection failed (Response code: REFUSED)
  • zs1.rz.rwth-aachen.de
    • Status: Responded
    • IP(s): 137.226.107.63
    • TTL: 86400 seconds
    • Recursive Queries: Does not allow recursive queries
    • TCP Connectivity: TCP connection failed (Response code: REFUSED)
  • dns-2.dfn.de
    • Status: Responded
    • IP(s): 137.226.107.63
    • TTL: 86400 seconds
    • Recursive Queries: Does not allow recursive queries
    • TCP Connectivity: TCP connection failed (Response code: REFUSED)
  • zs2.rz.rwth-aachen.de
    • Status: Responded
    • IP(s): 137.226.107.63
    • TTL: 86400 seconds
    • Recursive Queries: Does not allow recursive queries
    • TCP Connectivity: TCP connection failed (Response code: REFUSED)

SOA Records

dns-1.dfn.de
  • Serial: 2024083001
  • Refresh: 10800
  • Retry: 3600
  • Expire: 3600000
  • Minimum TTL: 600
zs1.rz.rwth-aachen.de
  • Serial: 2024083001
  • Refresh: 10800
  • Retry: 3600
  • Expire: 3600000
  • Minimum TTL: 600
dns-2.dfn.de
  • Serial: 2024083001
  • Refresh: 10800
  • Retry: 3600
  • Expire: 3600000
  • Minimum TTL: 600
zs2.rz.rwth-aachen.de
  • Serial: 2024083001
  • Refresh: 10800
  • Retry: 3600
  • Expire: 3600000
  • Minimum TTL: 600

Serial: 2024083001 - OK

REFRESH: 10800 - OK

RETRY: 3600 - OK

EXPIRE: 3600000 - OK

MINIMUM TTL: 600 - Note: Outside recommended range (1-3 hours)

MX Records

dns-1.dfn.de
zs1.rz.rwth-aachen.de
dns-2.dfn.de
zs2.rz.rwth-aachen.de

MX Record Consistency - OK

MX Record Count - Warning: Only one MX record

Reverse MX A records (PTR)

  • 57.78.226.137.in-addr.arpa -> mx1.rz.rwth-aachen.de

PTR Records - OK

DNSSEC

DNSSEC Inspector
  • Signed: Yes
  • Validation: Successful
  • DNSKEY Records: 3
  • DS Records in parent zone: 0
  • DS at Parent: None

DNSSEC - OK

SPF (Sender Policy Framework)

SPF Record Published: Passed

Multiple SPF Records: Passed

SPF Record 1:
  • Record: v=spf1 include:_spf.itc.rwth-aachen.de ~all
  • SPF Syntax: Passed
  • Deprecated Elements: Passed
  • IP Addresses:
  • Includes: _spf.itc.rwth-aachen.de
  • DNS Lookups: 4
  • Void Lookups: Passed
  • Escaping Chars: Not Present
  • All Mechanism: ~all

DKIM (DomainKeys Identified Mail)

  • DKIM Records Found: No
Warnings:
  • No DKIM records found for common selectors

DMARC

  • Record: None
  • Syntax: Invalid
  • Policy: None
  • RUA (Aggregate Reports):
DMARC External Validation:
  • All external domains in your DMARC record are giving permission to send them DMARC reports.
Errors:
  • DMARC record does not exist
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