Referenced Domain IPv4/IPv6 Web Statistics

Background and Methodology	IPv6 & DNSSEC SnapShots
USG IPv6 & DNSSEC Statistics	USG IPv4 Statistics
Industry IPv6 & DNSSEC Statistics	Industry IPv4 Statistics
University IPv6 & DNSSEC Statistics	University IPv4 Statistics
CFO Act Agency Summary Statistics	USG IPv6 Enabled WWW Sites

- Referenced Domain Web Statistics for 2026.07.21 -

gov.pubmed. | Department of Health and Human Services	v4[s]	v4[B]	v4[Mbps]	v6[s]	v6[B]	v6[Mbps]	6/4[Mbps]	v4|v6
com.facebook.www  (https)	0.987492	422835	3.27	1.163347	425430	2.79	85%	graph
com.github  (https)	0.584172	578275	7.55	0.003031	0	0	n/a	graph
com.google-analytics.www  (https)  [v4R] 2/0.082982s  [v6R] 2/0.160436s	0.124825	118475	7.29	0.203426	118475	4.45	61%	graph
com.google.www  (https)	0.075988	80969	8.24	0.332283	80836	1.86	23%	graph
com.linkedin.www  (https)	0.250910	141609	4.32	0.458802	141608	2.36	55%	graph
com.twitter  (https)  [v4R] 1/0.064579s	0.533124	266111	3.81	0.003030	0	0	n/a	graph
com.youtube.www  (https)	0.265079	835035	24.04	0.316021	836343	20.19	84%	graph
gov.hhs.www  (https)	0.118281	365	0.02	0.050219	365	0.06	236%	graph
gov.nih.nlm.ncbi.account  (https)	1.078742	4899702	34.68	0.649393	4899702	57.60	166%	graph
gov.nih.nlm.ncbi.cdn  (https)	0.070838	119140	12.99	0.314673	119140	2.89	22%	graph
gov.nih.nlm.ncbi.ncbiinsights  (https)	0.291833	165685	4.34	0.008361	0	0	n/a	graph
gov.nih.nlm.ncbi.pubmed  (https)	0.118179	42397	2.74	0.348895	42397	0.93	34%	graph
gov.nih.nlm.ncbi.www  (https)	0.043069	39223	6.96	1.052270	39223	0.28	4%	graph
gov.nih.nlm.support  (https)	0.970513	44020	0.35	0.002517	0	0	n/a	graph
gov.nih.nlm.www  (https)	0.071152	33490	3.60	0.091434	33490	2.81	78%	graph
gov.nih.www  (https)	0.181333	62629	2.64	0.078029	62629	6.13	232%	graph
• gov.pubmed.www  (https)  [v4R] 1/0.293727s  [v6R] 1/0.254451s	0.394330	42397	0.82	0.333798	42397	0.97	118%	graph
gov.usa.www  (https)	0.041971	47199	8.78	0.048916	47199	7.50	85%	graph
IPv6 operational: 100% of linked subdomains (1/1), 78% of all linked domains (14/18)	v4[s]	v4[B]	v4[Mbps]	v6[s]	v6[B]	v6[Mbps]	6/4[Mbps]	v4|v6

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