All Dns servers are responding
One or more servers are not responding (timeout, refused, ...)
Analysis report on IP address: 203.242.75.241
Resume
DNS servers IP are in different class C
IPs have the same C class.
Domain have at least 2 DNS servers
DNS require at least 2 name servers.
SOA email is valid
Email address used in SOA is not valid
DNS
Dns servers for 75.242.203.in-addr.arpa
203.242.75.241 was detected as ipv4
- Name
- ns.skc.co.kr
- IPs
Possible problem in Dns Tree
We have detected the following error on one or more server(s).
Consult Tree for more details.
- Refuse to respond or is in timeout state.
Query informations
- Server
- l.root-servers.net
[ 199.7.83.42 ] - Duration
- 18 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- a.in-addr-servers.arpa
- IPs
- Name
- b.in-addr-servers.arpa
- IPs
- Name
- c.in-addr-servers.arpa
- IPs
- Name
- d.in-addr-servers.arpa
- IPs
- Name
- e.in-addr-servers.arpa
- IPs
- Name
- f.in-addr-servers.arpa
- IPs
Query informations
- Server
- a.in-addr-servers.arpa
[ 199.180.182.53 ] - Duration
- 141 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- b.in-addr-servers.arpa
[ 199.253.183.183 ] - Duration
- 35 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- c.in-addr-servers.arpa
[ 196.216.169.10 ] - Duration
- 183 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- d.in-addr-servers.arpa
[ 200.10.60.53 ] - Duration
- 235 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- e.in-addr-servers.arpa
[ 203.119.86.101 ] - Duration
- 249 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- f.in-addr-servers.arpa
[ 193.0.9.1 ] - Duration
- 19 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- apnic.authdns.ripe.net
- IPs
- Name
- apnic1.dnsnode.net
- IPs
- Name
- ns2.apnic.net
- IPs
- Name
- ns3.lacnic.net
- IPs
- Name
- rirns.arin.net
- IPs
Query informations
- Server
- apnic.authdns.ripe.net
[ 193.0.9.9 ] - Duration
- 23 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
Query informations
- Server
- apnic1.dnsnode.net
[ 194.146.106.106 ] - Duration
- 22 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
Query informations
- Server
- ns2.apnic.net
[ 203.119.95.53 ] - Duration
- 32 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
Query informations
- Server
- ns3.lacnic.net
[ 200.3.13.14 ] - Duration
- 208 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
Query informations
- Server
- rirns.arin.net
[ 199.253.249.53 ] - Duration
- 143 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
Query informations
- Server
- b.dns.kr
[ 210.101.60.1 ] - Duration
- 773 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- c.dns.kr
[ 210.101.61.1 ] - Duration
- 278 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- d.dns.kr
[ 203.83.159.1 ] - Duration
- 219 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- e.dns.kr
[ 202.30.124.100 ] - Duration
- 211 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- f.dns.kr
[ 210.101.62.1 ] - Duration
- 539 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- g.dns.kr
[ 202.31.190.1 ] - Duration
- 226 ms
- Type
- authority
- Headers
- RCODE : 0 AA : 0 TC : 0
Response
- Name
- ns.nuri.net
- IPs
- Name
- ns.skc.co.kr
- IPs
Query informations
- Server
- ns.nuri.net
[ 203.235.122.164 ] - Duration
- 290 ms
- Type
- refused
- Headers
- RCODE : 5 AA : 0 TC : 0
Le serveur refuse de répondre à la requête de type edns.
Query informations
- Server
- ns.skc.co.kr
[ 203.242.127.90 ] - Duration
- 223 ms
- Type
- unknown
- Headers
- RCODE : 0 AA : 1 TC : 0
DNSSEC analysis not possible on an IP
All Dns servers are responding
One or more servers are not responding (timeout, refused, ...)
Every DNS servers should be accessible and accept public query.
0.009s
DNS servers IP are in different class C
IPs have the same C class.
The class C of each IP must be different so that the servers are not found on the same bay and therefore there is a risk of unavailability.
RFC0.000s
Domain have at least 2 DNS servers
DNS require at least 2 name servers.
In order for the availability rate of DNS servers to be at its highest, it is vital and recommended by the RFC to have at least 2 servers.
RFC0.001s
SOA email is valid
Email address used in SOA is not valid
BIND version is hidden
Passed
The Bind version should not be visible otherwise it will be possible to search for potential security vulnerabilities of the version.
1.003s
All servers return success
Passed
It's important that all servers returned a "success" code.
0.008s
Responses are not CNAME or A
Passed
SOA are synchronized
Passed
The SOA answered by the DNS servers must be identical for each servers. The most important information is the master server and the contact email address.
0.000s
SOA refresh is valid
Passed
SOA retry, refresh and expire values are correct
Passed
DNS servers are not open relay
Passed
DNS resolvers that allow queries from all IP addresses and are exposed to the Internet can be attacked and used to conduct Denial of Service (DoS) attacks on behalf of the hacker.
0.221s
Transfer zone is disable
Passed
An attacker can use a zone transfer that contains a malicious code or an inappropriate format that crashes a DNS server vulnerable to this type of attack, which results in a DoS that destabilizes the DNS services. It is possible to test it manually with this commands: #host -T axfr or #dig axfr.
documentation0.707s
Recursive query is disable
Passed
Having a dns server that allow recursive queries is a security risk, DDOS attack can be performed.
RFC documentation documentation0.220s
DNS servers IP are not private
Passed
DNS servers IP are differents
Skipped
IPs for DNS servers must be different in order to have high availability.
0.000s
DNS servers are synchronized
Skipped
The synchronization of the DNS servers must be perfect in order to avoid any dns resolution error. The servers must therefore give the same answer when asked "what are the DNS servers for the domain?".
0.000s
Ip
Informations
- Ip
- 203.242.75.241
- Type
- ipv4
- Reverse
- vcrpall2.skc.kr
- ARPA
- 241.75.242.203.in-addr.arpa
- Class C
- 203.242.75.0/24
- ASN
- 10049 SK Co.
- Organisation
- IM668-AP
- Maintainer
- MNT-KRNIC-AP
Reputation
- Blacklists
Ip
- Whois server
- whois.apnic.net
Raw data
% [whois.apnic.net] % Whois data copyright terms http://www.apnic.net/db/dbcopyright.html % Information related to '203.242.75.0 - 203.242.75.255' % Abuse contact for '203.242.75.0 - 203.242.75.255' is O32GiA== [at] nic.or.kr' inetnum: 203.242.75.0 - 203.242.75.255 netname: SK-NET descr: SK Co., country: KR admin-c: IM668-AP tech-c: IM668-AP status: ALLOCATED PORTABLE mnt-by: MNT-KRNIC-AP mnt-irt: IRT-KRNIC-KR last-modified: 2019-04-29T07:40:12Z source: APNIC % Information related to '203.242.75.0 - 203.242.75.255' inetnum: 203.242.75.0 - 203.242.75.255 netname: SK-NET-KR descr: SK Co., country: KR admin-c: IA126-KR tech-c: BS126-KR status: ALLOCATED PORTABLE mnt-by: MNT-KRNIC-AP mnt-irt: IRT-KRNIC-KR remarks: This information has been partially mirrored by APNIC from remarks: KRNIC. To obtain more specific information, please use the remarks: KRNIC whois server at whois.kisa.or.kr. changed: fIOHiIF1h4h5hg== [at] nic.or.kr source: KRNIC % This query was served by the APNIC Whois Service version 1.88.15-SNAPSHOT (WHOIS-UK4)
Blacklists
- RFC Ignorant
- Rbl Jp
- RblDns
- Sorbs
- Spam Eating Monkey
- SpamHaus
- SuRbl
- Support Intelligence
- Swinog
- UriBl
Ip is not blacklisted
Passed
An ip must not be blacklisted or it will be penalized for referencing and deliverability of emails.
0.000s
There is no mail server. Please test vcrpall2.skc.kr.
- Name
- vcrpall2.skc.kr
- IP
- 203.242.75.241
- Accessible
Autodiscover analysis not possible on an IP
Web
There is no web server. Please test vcrpall2.skc.kr.
- Url
- http://203.242.75.241/
- Timeout
- Yes
- Url
- https://203.242.75.241/
- Timeout
- Yes
HTTP port (80) is open
Skipped
This test verifies the presence of a website for the given IP or domain. Then scans port 80.
If the domain or IP is pointing to a website then port 80 must be open so that it can be accessed from a browser.
Otherwise port 80 must be closed.
0.000s
HTTPS port (443) is open
Skipped
This test verifies the presence of a website for the given IP or domain. Then scans port 443.
If the domain or IP is pointing to a website then port 443 must be open so that it can be accessed from a browser.
Otherwise port 443 must be closed.
0.000s
Web server version is hidden
Skipped
To avoid giving details to malicious people, the version of the server should not be visible.
0.000s
Web application technology is hidden
Skipped
To avoid giving details to malicious people, the technology that supports the application should not be visible.
0.000s
Cookies are secure
Skipped
Using "HttpOnly" instruction prevents someone to access to cookies via Javascript. The secure flag will allow you to prevent a cookie from ever being communicated in simple HTTP. (RFC 6265 section 8.3)
RFC0.000s
X-XSS-Protection header is present
Skipped
The HTTP X-XSS-Protection response header is a feature of Internet Explorer, Chrome and Safari that stops pages from loading when they detect reflected cross-site scripting (XSS) attacks.
documentation0.000s
Content Security Policy header is present
Skipped
The HTTP Content-Security-Policy response header allows web site administrators to control resources the user agent is allowed to load for a given page. With a few exceptions, policies mostly involve specifying server origins and script endpoints. This helps guard against cross-site scripting attacks (XSS).
documentation0.000s
Content Type Options header is present
Skipped
The only defined value, "nosniff", prevents Internet Explorer from MIME-sniffing a response away from the declared content-type. This also applies to Google Chrome, when downloading extensions.
0.000s