Domain technical report
Univerzitet u Beogradu
bg.ac.rs
IPv41
IPv60
MX1
NS6
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63
Total
70
DNS
20
Email
65
Security
50
Network
100
Availability
Domainbg.ac.rs
IPv41
IPv60
MX records1
StatusActive
DiagnosticsMain findings and recommendations
IPv4 (A)30 / 30 pts · Dns
1 IPv4 address(es) detected.
IPv6 (AAAA)0 / 10 pts · Dns
0 IPv6 address(es) detected.
Name server redundancy20 / 20 pts · Dns
6 NS record(s); 2 or more required.
SOA record10 / 10 pts · Dns
Authoritative zone record.
DNSSEC chain0 / 15 pts · Dns
Both DS and DNSKEY are required.
CAA policy0 / 5 pts · Dns
Certificate authority restriction.
DNS propagation10 / 10 pts · Dns
Agreement between public resolvers.
MX records20 / 20 pts · Mail
1 MX record(s).
SPF0 / 25 pts · Mail
SPF policy not found.
DMARC0 / 25 pts · Mail
DMARC policy not found.
DKIM0 / 20 pts · Mail
No tested DKIM selector responded.
MTA-STS0 / 5 pts · Mail
Mail transport policy.
TLS-RPT0 / 5 pts · Mail
TLS reporting policy.
Valid TLS certificate55 / 55 pts · Security
49 day(s) remaining.
Certificate lifetime10 / 10 pts · Security
Full points require at least 30 days remaining.
HTTP security headers0 / 35 pts · Security
0 of 9 evaluated headers detected.
PTR reverse DNS30 / 30 pts · Network
PTR: www.bg.ac.rs
IPv4 diversity20 / 35 pts · Network
Two or more IPv4 addresses receive full points.
IPv6 connectivity0 / 35 pts · Network
AAAA availability.
DNS resolution40 / 40 pts · Availability
At least one address family must resolve.
HTTP response40 / 40 pts · Availability
HTTP/1.1 200 OK
HTTPS final URL20 / 20 pts · Availability
Final URL uses HTTPS.
DNS and emailPublished records and email configuration
A
1 record(s)147.91.1.21
AAAA
0 record(s)—
Not configured
CNAME
0 record(s)—
Not configured
MX
1 record(s)10 afrodita.rcub.bg.ac.rs.
TXT
2 record(s)"MS=ms53222499" "google-site-verification=bY9rewdJu5IJ6vSMm50GR4x17yDjSTVuByA_QCDAts4"
NS
6 record(s)ns.etf.bg.ac.rs. gaea.rcub.bg.ac.rs. ns.unic.kg.ac.rs. ban.junis.ni.ac.rs. ns.rcub.bg.ac.rs. ns1.uns.ac.rs.
SOA
1 record(s)ns.rcub.bg.ac.rs. helpdesk.rcub.bg.ac.rs. 2026071600 10800 3600 604800 86400
CAA
0 record(s)—
Not configured
DS
0 record(s)—
Not configured
DNSKEY
0 record(s)—
Not configured
RRSIG
0 record(s)—
Not configured
NSEC
0 record(s)—
Not configured
NSEC3
0 record(s)—
Not configured
SRV
0 record(s)—
Not configured
NAPTR
0 record(s)—
Not configured
TLSA
0 record(s)—
Not configured
SSHFP
0 record(s)—
Not configured
SPF
Not configured—
Not configured
DMARC
Not configured—
Not configured
DKIM
Not found—
Not configured
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
Univerzitet u Beogradu
Description
Final URL
https://www.bg.ac.rs/
HTTP status
200
HTTP
Status
HTTP/1.1 200 OK
Final URL
https://www.bg.ac.rs/
Version
2
Server
nginx/1.18.0 (Ubuntu)
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
Let's Encrypt
CN
www.bg.ac.rs
Valid from
2026-06-29T20:06:53-05:00
Valid until
2026-09-27T20:06:52-05:00
Days remaining
49
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384
Security headers
0 activeHSTSNot detected
Content Security PolicyNot detected
X-Content-Type-OptionsNot detected
X-Frame-OptionsNot detected
Referrer PolicyNot detected
Permissions PolicyNot detected
Cross-Origin-Opener-PolicyNot detected
Cross-Origin-Embedder-PolicyNot detected
Cross-Origin-Resource-PolicyNot detected
DNS propagationComparison across public resolvers
Public resolver comparison
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.8147.91.1.21
182,32 ms
Cloudflare
1.1.1.1147.91.1.21
186,57 ms
Quad9
9.9.9.9147.91.1.21
183,80 ms
OpenDNS
208.67.222.222147.91.1.21
2.464,84 ms
AdGuard
94.140.14.14147.91.1.21
154,08 ms
IP, geolocation and ASNAssociated network information
147.91.1.21
Identifiedsuccess
Yes
country
Serbia
country_code
RS
region
Raska
city
Kraljevo
latitude
43.7224424
longitude
20.6830539
asn
13092
organization
Akademska mreza Republike Srbije - AMRES
isp
Akademska mreza Republike Srbije - AMRES
timezone
Europe/Belgrade
Visitor information
Visitorip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No
SMTPEmail port connectivity
afrodita.rcub.bg.ac.rs
Port 25: Closed/unreachable - 134.6 ms - Port 465: Closed/unreachable - 274 ms - Port 587: Closed/unreachable - 271.9 ms - 220 afrodita.rcub.bg.ac.rs ESMTP