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A Historical View of the AS Core

A Historical View of the AS Core

Since 2000, CAIDA has generated AS Core graphs -- Internet Topology Maps also referred to as AS-level Internet Graphs -- in order to visualize the shifting topology of the Internet over time.

Versions of the AS core made at different times give a historical perspective on how the global Internet is changing.

Historical View

The images below expand to a larger version, and bulleted links in the right column lead to related write-ups and analyses.

2020
Jan
IPv4 AS Core 2020 IPv6 AS Core 2020
The net change in the number of IPv4 ASes between 2017 and 2020 was 13,680 (+32.91%), and a 37,618 (+30.07%) increase of AS Links. This also includes an increase of 13,622,753 (+38.80%) unique IP Addresses observed. Data collected from 121 monitors located in 42 countries on 6 continents.
Data source: Ark		 The net change in the number of IPv6 ASes was 1,691 (+16.02%), a 13,264 (+32.28%) increase in AS Links, and a net increase of 361,733,728 (+62.51%) IPs.
Data source: Ark
2017
Feb
IPv4 AS Core February 2017
Almost 50 million IP addresses, 36 million IP links 47,610 Autonomous Systems (ASes), 148,455 links. Data collected from 121 monitors located in 42 countries on 6 continents.
Data source: Ark
2015
Jan
IPv4 AS Core January 2015 IPv6 AS Core January 2015
42,048,676 IP addresses, 33,899,735 IP links, 281 million destinations, 92.7% of globally routable network prefixes, 39,809 Autonomous Systems (ASes), 152,438 peering sessions. Data collected from 118 monitors located in 42 countries on 6 continents.
Data source: Ark		 71,391 IPv6 addresses, 186,567 IPv6 links, 4.9 million destinations, 89.3% of globally routeable network prefixes, 5,326 Autonomous Systems (ASes), 21,820 peering sessions. Data collected from 47 Ark monitors located in 25 countries on 6 continents.
Data source: Ark
2014
Jan
IPv4 AS Core January 2014 IPv6 AS Core January 2014
37,541,408 IP addresses, 31,075,574 IP links, 263 million destinations, 92.4% of globally routable network prefixes, 37,197 Autonomous Systems (ASes), 130,095 peering sessions. Data collected from 74 monitors located in 33 countries on 6 continents.
Data source: Ark		 51,884 IPv6 addresses, 133,988 IPv6 links, 3.3 million destinations, 76.1% of globally routeable network prefixes, 4,337 Autonomous Systems (ASes), 16,856 peering sessions. Data collected from 33 Ark monitors located in 21 countries on 6 continents.
Data source: Ark
2013
Jan
IPv4 AS Core January 2013 IPv6 AS Core January 2013
27,954,132 IP addresses, 23,494,835 IP links, 214 million destinations, 93.5% of globally routable network prefixes, 34,082 Autonomous Systems (ASes), 109,354 peering sessions. Data collected from 58 monitors located in 29 countries on 6 continents.
Data source: Ark		 36,055 IPv6 addresses, 91,420 IPv6 links, 2 million destinations, 82.2% of globally routeable network prefixes, 2,419 Autonomous Systems (ASes), 8,881 peering sessions. Data collected from 26 Ark monitors located in 18 countries on 6 continents.
Data source: Ark
2012
Jan
IPv4 AS Core January 2012 IPv6 AS Core January 2012
22,295,909 IP addresses, 18,968,662 IP links, 192 million destinations, 87% of globally routable network prefixes, 30,799 Autonomous Systems (ASes), 95,242 peering sessions. Data collected from 51 monitors located in 25 countries on 6 continents.
Data source: Ark		 24,725 IPv6 addresses, 60,860 IPv6 links, 1.4 million destinations, 92% of globally routeable network prefixes, 1,923 Autonomous Systems (ASes), 7,605 peering sessions. Data collected from 23 Ark monitors located in 14 countries on 6 continents.
Data source: Ark
2011
Apr
IPv4 AS Core April 2011 IPv6 AS Core April 2011
23,037,154 IP addresses, 20,187,579 IP links, 207 million destinations, 93.3% of globally routable network prefixes, 29,316 Autonomous Systems (ASes), 77,610 peering sessions. Data collected from 54 monitors located in 29 countries on 6 continents.
Data source: Ark		 14,683 IPv6 addresses, 33,927 IPv6 links, 307 thousand destinations, 71.9% of globally routeable network prefixes, 1,183 Autonomous Systems (ASes), 2,738 peering sessions. Data collected from 16 Ark monitors located in 12 countries on 4 continents.
Data source: Ark
2010
Aug
IPv4 AS Core August 2010 IPv6 AS Core August 2010
16,802,061 IP addresses, 18,796,744 IP links, 174 million destinations, 96% of globally routable network prefixes, 26,702 Autonomous Systems (ASes), 85,104 peering sessions. Data collected from 45 monitors located in 24 countries on 6 continents.
Data source: Ark		 8,551 IPv6 addresses, 21,852 IPv6 links, 307 thousand destinations, 99.6% of globally routeable network prefixes, 715 Autonomous Systems (ASes), 1,672 peering sessions. Data collected from 12 Ark monitors located in 6 countries on 3 continents.
Data source: Ark
2009
Jan
IPv4 AS Core January 2009 IPv6 AS Core January 2009
4,853,911 IP addresses, 5,682,419 IP links, 7.4 million destinations, 95% of globaly routable network prefixes, 17,791 Autonomous Systems (ASes), 50,333 peering sessions. Data collected from 33 monitors located in 30 countries on 5 continents.
Data source: Ark		 4,752 IPv6 addresses, 17,036 IPv6 links, 1,491 destinations, 88.9% of globally routeable network prefixes, 489 Autonomous Systems (ASes), 1,904 peering sessions. Data collected from 6 Ark monitors located in 4 countries on 2 continents.
Data source: Ark
2008
Jan
AS Core IPv4 2008 AS Core IPv6 2008
4,853,991 IP addresses, 5,682,419 IP links, 48 million destinations, 94.9% of globally routable network prefixes, 17,791 Autonomous Systems (ASes), 50,333 peering sessions. Data collected from 13 monitors located in 11 countries on 3 continents.
Data source: Ark 		4,752 IPv6 addresses, 17,036 IPv6 links, 2,358 destinations, 80% of globally routable network prefixes, 489 Autonomous Systems (ASes), 1,904 peering sessions. Data collected from 56 contributors in 53 different cities located in 9 countries on 3 continents.
Data source: volunteer data
2007
Aug
AS Core IPv4 2007
760,922 IP addresses, 1,400,796 IP links, 1 million destinations, 26.7% of globally routable network prefixes, 12,465 Autonomous Systems (ASes), 35,589 peering sessions.
Data source: Ark
2005
Apr
AS Core IPv4 2005 AS Core IPv6 2005
926,201 IP addresses, 2,000,796 IP links, 865,000 destinations, 50% of globally routable network prefixes; 10,131 ASes (78% of ASes present in RouteViews BGP tables on Apr 17, 2005), 29,191 peering sessions.
Data source: Ark 		2,913 IPv6 addresses, 7,905 IPv6 links, 333 Autonomous Systems (ASes), 1,304 peering sessions. Data collected from 17 contributors on 3 continents.
Data source: volunteer data
2003
Apr
AS Core IPv4 March 2003
1,134,634 IP addresses, 2,434,073 IP links, 865,000 destinations, 62% of globally routable network prefixes; 11,411 ASes (73% of ASes present in RouteViews BGP tables on May 8, 2003), 32,209 peering sessions.
Data source: skitter
2002
Apr
AS Core IPv4 April 2002
1,224,733 IP addresses, 2,093,194 IP links, 932,000 destinations, 70% of globally routable network prefixes; 10,999 ASes (84% of ASes present in RouteViews BGP tables on April 15,2002), 34,209 peering sessions.
Data source: skitter
2001
Jul
AS Core IPv4 July 2001
Data source: skitter
2000
Oct
AS Core IPv4 October 2000
626,773 IP addresses, 1,007,723 IP links, 52% of globally routable network prefixes; 7,563 ASes (81% of A Ses present in RouteViews BGP tables on October 15, 2000), 25,005 peering sessions.
Data source: skitter
2000
Jan
IPv4 AS Core January 2009
220,533 IP addresses, 374,013 IP links, 154,104 destinations, 5,107 ASes (7% of ASes present in RouteViews BGP tables on January 16, 2000).
Data source: skitter
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