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AS15576NTS workspace AG

SwitzerlandRegistryRIPE NCCTypeCarrier

As of 10th November 2026, AS15576 (NTS workspace AG), a transit carrier registered in Switzerland with RIPE NCC, originates 43 IPv4 prefixes covering 47.6k addresses and 13 IPv6 prefixes. By IPv4 address space that makes it the 4,623rd-largest of the 80,733 networks we see originating IPv4, and the 39th-largest of 746 in Switzerland. It is seen behind 31 upstream networks, most often AS8220 (COLT) and AS3356 (Lumen (Level 3)), and in front of 34 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 96% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

43

IPv6 prefixes

13

IPv4 addresses

47.6k

IPv6 /64s

64.7B

Upstream graph

The networks AS15576 is seen behind, one and two hops out, drawn from real AS paths.

AS15576Toward the internet core
Upstream graph for AS15576: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS15576NTS workspace AGThis networkAS174Cogent Communicat…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS8220COLTAS39122Blacknight Intern…AS151326DCConnect Communi…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS132337AxclusiveAS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS15576 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

745

adjacent networks

Upstreams
314%
Peers
68091%
Downstreams
345%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS15576
NetworkCountryRelationshipPathsVantage pts
AS8220COLTGBPeer4,64175
AS3356Lumen (Level 3)USPeer2,14384
AS174Cogent Communications, LLCUSPeer1,04393
AS6939Hurricane Electric LLCUSPeer21711
AS39122Blacknight Internet Solutions LimitedIEPeer2082
AS23673Cogetel Online, Cambodia, ISPKHAdjacent1952
AS4775Globe TelecomsPHAdjacent1532
AS58511Swoop (Anycast Global Backbone)AUPeer1302
AS24940Hetzner Online GmbHDEPeer1242
AS3303Swisscom (Schweiz) AGCHPeer1221

Prefixes

All 56

The largest blocks AS15576 originates, widest first.

Largest prefixes originated by AS15576
PrefixAddressesVisibility
212.103.64.0/198.2k75/76
217.11.208.0/204.1k75/76
217.68.224.0/204.1k75/76
217.146.160.0/204.1k75/76
77.95.120.0/212k75/76
85.118.216.0/212k75/76
94.126.248.0/212k75/76
188.92.224.0/212k75/76
217.197.128.0/212k75/76
87.237.168.0/221k75/76

Routing health

How AS15576's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%56
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more96.4%54
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%3.6%2

Prefix sizes

IPv4 — 43 prefixes

IPv6 — 13 prefixes

  • /2934.4B × /647.7%1
  • /324.3B × /6453.8%7
  • /36268M × /647.7%1
  • /4865.5k × /6430.8%4

Recent changes

Announcements that started or stopped since 12th Oct 2026.

  • Withdrawn2a04:4c00::/2924th Oct 2026

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.