KDOC 517: DNS階層をたどる様子を見る

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概要

dig +trace www.github.com

; <<>> DiG 9.18.30-0ubuntu0.24.04.1-Ubuntu <<>> +trace www.github.com
;; global options: +cmd
.			6976	IN	NS	a.root-servers.net.
.			6976	IN	NS	l.root-servers.net.
.			6976	IN	NS	e.root-servers.net.
.			6976	IN	NS	m.root-servers.net.
.			6976	IN	NS	h.root-servers.net.
.			6976	IN	NS	i.root-servers.net.
.			6976	IN	NS	d.root-servers.net.
.			6976	IN	NS	k.root-servers.net.
.			6976	IN	NS	g.root-servers.net.
.			6976	IN	NS	b.root-servers.net.
.			6976	IN	NS	c.root-servers.net.
.			6976	IN	NS	f.root-servers.net.
.			6976	IN	NS	j.root-servers.net.
;; Received 239 bytes from 127.0.0.53#53(127.0.0.53) in 0 ms

;; UDP setup with 2001:dc3::35#53(2001:dc3::35) for www.github.com failed: network unreachable.
;; no servers could be reached
;; UDP setup with 2001:dc3::35#53(2001:dc3::35) for www.github.com failed: network unreachable.
;; no servers could be reached
;; UDP setup with 2001:dc3::35#53(2001:dc3::35) for www.github.com failed: network unreachable.
;; UDP setup with 2001:503:c27::2:30#53(2001:503:c27::2:30) for www.github.com failed: network unreachable.
com.			172800	IN	NS	l.gtld-servers.net.
com.			172800	IN	NS	c.gtld-servers.net.
com.			172800	IN	NS	k.gtld-servers.net.
com.			172800	IN	NS	m.gtld-servers.net.
com.			172800	IN	NS	i.gtld-servers.net.
com.			172800	IN	NS	b.gtld-servers.net.
com.			172800	IN	NS	h.gtld-servers.net.
com.			172800	IN	NS	e.gtld-servers.net.
com.			172800	IN	NS	d.gtld-servers.net.
com.			172800	IN	NS	f.gtld-servers.net.
com.			172800	IN	NS	a.gtld-servers.net.
com.			172800	IN	NS	g.gtld-servers.net.
com.			172800	IN	NS	j.gtld-servers.net.
com.			86400	IN	DS	19718 13 2 8ACBB0CD28F41250A80A491389424D341522D946B0DA0C0291F2D3D7 71D7805A
com.			86400	IN	RRSIG	DS 8 1 86400 20260103170000 20251221160000 61809 . LyStNQm9+1ankIVATIyU/cW7QtLvLE7NfHzzVnKqTLu6ko4/slJmY1QU bmhcRd6Z3e+u1k04++RixtKc/5N7MQ5olnze3pZ9y9VX0AdyGqnLSINP Ui3hZr5NIu3mTgjTt2PttfIEe1V0qrgaC903fIaNSdL2nISm49u5zoG6 LJ4l7rrDVt2pNvR+KiZtbSWp7ULt4jJLvQWjsvpfADnq2UqgOSVqNIvk kDQ8fXYFoNXETBHkdZ1NEQbIl/e4cj2vk0I4q5eeJReuKKamWjIxY6Zb GLnvjDVh2mAjVQcbkjde5r7oxrcJiK8z3Tx6Yd0QFns0g92/0JMukcZY r7em8g==
;; Received 1205 bytes from 192.33.4.12#53(c.root-servers.net) in 2 ms

;; UDP setup with 2001:502:7094::30#53(2001:502:7094::30) for www.github.com failed: network unreachable.
;; UDP setup with 2001:503:a83e::2:30#53(2001:503:a83e::2:30) for www.github.com failed: network unreachable.
github.com.		172800	IN	NS	ns-520.awsdns-01.net.
github.com.		172800	IN	NS	ns-421.awsdns-52.com.
github.com.		172800	IN	NS	ns-1707.awsdns-21.co.uk.
github.com.		172800	IN	NS	ns-1283.awsdns-32.org.
github.com.		172800	IN	NS	dns1.p08.nsone.net.
github.com.		172800	IN	NS	dns2.p08.nsone.net.
github.com.		172800	IN	NS	dns3.p08.nsone.net.
github.com.		172800	IN	NS	dns4.p08.nsone.net.
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 900 IN NSEC3 1 1 0 - CK0Q3UDG8CEKKAE7RUKPGCT1DVSSH8LL NS SOA RRSIG DNSKEY NSEC3PARAM
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 900 IN RRSIG NSEC3 13 2 900 20251225002706 20251217231706 46539 com. gmHVJS+WmLxYXTQMDYmfFRMcTSDHtHHXgSTWPo3FbOjYVV6GmpBv4Rd3 q91lGtsv8vkur4/nrD7LolMHJ4gpqw==
4KB4M5P0V10KIBJ8HQ2VH9EMME8NV6MR.com. 900 IN NSEC3 1 1 0 - 4KB4V9IAMJL29MC1VBJ8NDO7E6SI2B8O NS DS RRSIG
4KB4M5P0V10KIBJ8HQ2VH9EMME8NV6MR.com. 900 IN RRSIG NSEC3 13 2 900 20251225021105 20251218010105 46539 com. 8mEzmw5hy48Fr2ps/fSxqKgLwBWLyLUV3RwXyj9cQshaoXLOhqhpIawj /fvfrbiMADGGEIjO7zwfrk338jhexg==
;; Received 639 bytes from 192.43.172.30#53(i.gtld-servers.net) in 112 ms

;; UDP setup with 2620:4d:4000:6259:7:8:0:3#53(2620:4d:4000:6259:7:8:0:3) for www.github.com failed: network unreachable.
www.github.com.		3600	IN	CNAME	github.com.
github.com.		60	IN	A	20.27.177.113
;; Received 73 bytes from 198.51.44.72#53(dns3.p08.nsone.net) in 113 ms

関連

なし。