DNSstat domain details: columbia.edu

DNS zone details for: columbia.edu (Columbia University)

Date of latest check: Wed, 22 May 2013 22:29:16 -0400
Time required for check: 33.00 seconds

Zone Summary information:

6 Nameserver records (IPv4=6, IPv6=4)
12 Nameserver addresses (IPv4=7, IPv6=5)
Successful DNS/UDP response: 10 of 12 servers
Successful DNS/TCP response: 10 of 12 servers
Successful DNS/IPv4 response: 7 of 7 servers
Successful DNS/IPv6 response: 3 of 5 servers
Successful DNS/EDNS0 response: 10 of 12 servers
Zone fails for DNS over TCP queries on some or all of its servers (10 responses of 12)
Zone advertises IPv6 on at least one of its servers (3 of 5 IPv6 addresses responded)
Zone does NOT support DNSSEC (DNS Security Extensions)

Debugging information:

Found nameserver: ext-ns1.columbia.edu.
	Found IPv4 address: 128.59.1.1
Found nameserver: dns2.itd.umich.edu.
	Found IPv4 address: 141.211.125.15
Found nameserver: adns1.berkeley.edu.
	Found IPv6 address: 2607:f140:ffff:fffe::3
	Found IPv4 address: 128.32.136.3
Found nameserver: ns1.lse.ac.uk.
	Found IPv4 address: 158.143.233.4
	Found IPv4 address: 158.143.96.8
	Found IPv6 address: 2002:9e8f:e904::9e8f:e904
	Found IPv6 address: 2002:9e8f:6008::9e8f:6008
Found nameserver: adns2.berkeley.edu.
	Found IPv6 address: 2607:f140:ffff:fffe::e
	Found IPv4 address: 128.32.136.14
Found nameserver: sns-pb.isc.org.
	Found IPv6 address: 2001:500:2e::1
	Found IPv4 address: 192.5.4.1
NS records 6, IP4 6, IP6 4
NS: ext-ns1.columbia.edu. has no IPv6 address record
NS: dns2.itd.umich.edu. has no IPv6 address record
Trying DNS/UDP query to ext-ns1.columbia.edu., 128.59.1.1
Trying DNS/UDP query to dns2.itd.umich.edu., 141.211.125.15
Trying DNS/UDP query to adns1.berkeley.edu., 128.32.136.3
Trying DNS/UDP query to adns1.berkeley.edu., 2607:f140:ffff:fffe::3
Trying DNS/UDP query to ns1.lse.ac.uk., 158.143.233.4
Trying DNS/UDP query to ns1.lse.ac.uk., 158.143.96.8
Trying DNS/UDP query to ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904
DNS/UDP failed: ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904 (<class 'dns.exception.Timeout'>, )
Trying DNS/UDP query to ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008
DNS/UDP failed: ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008 (<class 'dns.exception.Timeout'>, )
Trying DNS/UDP query to adns2.berkeley.edu., 128.32.136.14
Trying DNS/UDP query to adns2.berkeley.edu., 2607:f140:ffff:fffe::e
Trying DNS/UDP query to sns-pb.isc.org., 192.5.4.1
Trying DNS/UDP query to sns-pb.isc.org., 2001:500:2e::1
DNS/UDP success: 10 of 12 servers
Trying DNS/TCP query to ext-ns1.columbia.edu., 128.59.1.1
Trying DNS/TCP query to dns2.itd.umich.edu., 141.211.125.15
Trying DNS/TCP query to adns1.berkeley.edu., 128.32.136.3
Trying DNS/TCP query to adns1.berkeley.edu., 2607:f140:ffff:fffe::3
Trying DNS/TCP query to ns1.lse.ac.uk., 158.143.233.4
Trying DNS/TCP query to ns1.lse.ac.uk., 158.143.96.8
Trying DNS/TCP query to ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904
DNS/TCP failed: ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904 (<class 'dns.exception.Timeout'>, )
Trying DNS/TCP query to ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008
DNS/TCP failed: ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008 (<class 'dns.exception.Timeout'>, )
Trying DNS/TCP query to adns2.berkeley.edu., 128.32.136.14
Trying DNS/TCP query to adns2.berkeley.edu., 2607:f140:ffff:fffe::e
Trying DNS/TCP query to sns-pb.isc.org., 192.5.4.1
Trying DNS/TCP query to sns-pb.isc.org., 2001:500:2e::1
DNS/TCP success: 10 of 12 servers
Trying EDNS0 SOA query to ext-ns1.columbia.edu., 128.59.1.1
EDNS0 payload 4096 from ext-ns1.columbia.edu., 128.59.1.1
Trying EDNS0 SOA query to dns2.itd.umich.edu., 141.211.125.15
EDNS0 payload 4096 from dns2.itd.umich.edu., 141.211.125.15
Trying EDNS0 SOA query to adns1.berkeley.edu., 128.32.136.3
EDNS0 payload 4096 from adns1.berkeley.edu., 128.32.136.3
Trying EDNS0 SOA query to adns1.berkeley.edu., 2607:f140:ffff:fffe::3
EDNS0 payload 4096 from adns1.berkeley.edu., 2607:f140:ffff:fffe::3
Trying EDNS0 SOA query to ns1.lse.ac.uk., 158.143.233.4
EDNS0 payload 4000 from ns1.lse.ac.uk., 158.143.233.4
Trying EDNS0 SOA query to ns1.lse.ac.uk., 158.143.96.8
EDNS0 payload 4000 from ns1.lse.ac.uk., 158.143.96.8
Trying EDNS0 SOA query to ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904
DNS/UDP failed: ns1.lse.ac.uk., 2002:9e8f:e904::9e8f:e904 (<class 'dns.exception.Timeout'>, )
Trying EDNS0 SOA query to ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008
DNS/UDP failed: ns1.lse.ac.uk., 2002:9e8f:6008::9e8f:6008 (<class 'dns.exception.Timeout'>, )
Trying EDNS0 SOA query to adns2.berkeley.edu., 128.32.136.14
EDNS0 payload 4096 from adns2.berkeley.edu., 128.32.136.14
Trying EDNS0 SOA query to adns2.berkeley.edu., 2607:f140:ffff:fffe::e
EDNS0 payload 4096 from adns2.berkeley.edu., 2607:f140:ffff:fffe::e
Trying EDNS0 SOA query to sns-pb.isc.org., 192.5.4.1
EDNS0 payload 4096 from sns-pb.isc.org., 192.5.4.1
Trying EDNS0 SOA query to sns-pb.isc.org., 2001:500:2e::1
EDNS0 payload 4096 from sns-pb.isc.org., 2001:500:2e::1
DNS/EDNS0 success: 10 of 12 servers