AS208200 - FASTSERVERS-IT-AS Konstantin KirsanovRFC 4890 ✓RPKI ✓ 5/5ASPA -

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AS overview

Test target: 2a0f:b300:1002:2::8888 · ns2.fastservers.it · address space: unknown · prefixes announced: 5

prefix(es): 2a0f:b300:1002::/48, 2a0f:b300:1001::/48, 2a0f:b300:1111::/48, 2a0f:b300:b300::/48, 2a0f:b300:1000::/48

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a0f:b300:1002:2::8888
ns2.fastservers.it
drv??-??-??-??-??-??-??-

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

Not an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member, but our traceroute path crosses the MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO LAN from ITA host (Karsolink) - reached via an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO-resident transit operator.

RPKI & ASPA

5 of 5 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a0f:b300:1002::/48✓ validmatched VRP (correct origin, length within maxLength)AS208200 /36 maxLen 48 (ripe)
2a0f:b300:1001::/48✓ validmatched VRP (correct origin, length within maxLength)AS208200 /36 maxLen 48 (ripe)
2a0f:b300:1111::/48✓ validmatched VRP (correct origin, length within maxLength)AS208200 /36 maxLen 48 (ripe)
2a0f:b300:b300::/48✓ validmatched VRP (correct origin, length within maxLength)AS208200 /48 maxLen 48 (ripe)
2a0f:b300:1000::/48✓ validmatched VRP (correct origin, length within maxLength)AS208200 /36 maxLen 48 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 70 arbitrary IPv6 address(es) inside AS208200's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a00:5641:6164:16::b at hop 21 - that router answers ICMPv6 Echo. This is not in AS208200's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:08:13Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

multi-vantage path diagram for AS208200

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 40.1ms
4/4
Echo 1500B (DF) 40.1ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.2ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2sox-pn.sox.rs
2001:7f8:1e:8::3a
0.4ms0%AS13004SOX - Serbian Open Exchange DOO, RS
32001:7f8:1e:8::3d0.4ms0%AS13004SOX - Serbian Open Exchange DOO, RS
42001:67c:128c::69919.4ms0%-NA
5*-0%-
6*---
7*---
8*---
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---

tracepath -6

 1?: [LOCALHOST]                        0.014ms pmtu 1500
 1:  _gateway                                              0.790ms 
 1:  _gateway                                              0.567ms 
 2:  sox-pn.sox.rs                                         0.425ms 
 3:  2001:7f8:1e:8::3d                                     0.951ms asymm  2 
 4:  2001:67c:128c::699                                   17.341ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From DE host (Berlin)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 16.5ms
4/4
Echo 1500B (DF) 16.7ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02
0.5ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-150.cr10.fra01.lwlcom.net
2a00:c380:b200:230::174
10.1ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-100.cr10.fra02.lwlcom.net
2a00:c380:b200:230::215
10.6ms0%AS50629LWLCOM - LWLcom GmbH, DE
5ae0-10.cr10.fra06.lwlcom.net
2a00:c380:b200:230::236
10.2ms0%AS50629LWLCOM - LWLcom GmbH, DE
6ams-ix.1-ix.net
2001:7f8:115:1::7
27.2ms0%-NA
7*-50%-
82a03:9d40:ff00:25::116.1ms0%AS41095IPTP - IPTP LTD, GB
92a03:9d40:2701:1::316.2ms0%AS41095IPTP - IPTP LTD, GB
10*-0%-
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.614ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.413ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                       13.249ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.507ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.676ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.396ms asymm  7 
 6:  ams-ix.1-ix.net                                      27.578ms asymm  8 
 7:  2001:7f8:1::a504:1095:1                              16.546ms asymm  8 
 8:  2a03:9d40:ff00:25::1                                 16.436ms asymm  9 
 9:  2a03:9d40:2701:1::3                                  16.449ms asymm 10 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From DE host (Düsseldorf)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 10.2ms
4/4
Echo 1500B (DF) 10.2ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2eth1-0-12-h5594.edge5-dus1.bb.wiit.network
2001:4ba0:92f4:3::1
1.1ms0%AS24961MYLOC-AS - WIIT AG, DE
3*---
4lag11.core3-dus1.bb.wiit.network
2001:4ba0:ffe9:115::3
0.2ms0%AS24961MYLOC-AS - WIIT AG, DE
5lag2.core1-dus-ix.bb.wiit.network
2001:4ba0:ffe9:4f::1
0.5ms0%AS24961MYLOC-AS - WIIT AG, DE
6de-cix.iptp.net
2001:7f8::a087:0:1
4.2ms0%-NA
72a03:9d40:ff00:2f::110.4ms70%AS41095IPTP - IPTP LTD, GB
82a03:9d40:ff00:25::110.1ms0%AS41095IPTP - IPTP LTD, GB
92a03:9d40:2701:1::310.0ms0%AS41095IPTP - IPTP LTD, GB
10*-0%-
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.036ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.440ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.280ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.158ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.448ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.568ms 
 6:  de-cix.iptp.net                                       4.552ms 
 7:  2a03:9d40:ff00:2f::1                                 10.471ms 
 8:  2a03:9d40:ff00:25::1                                 10.215ms 
 9:  2a03:9d40:2701:1::3                                  10.155ms 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From NL host (go6lab)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 8.4ms
4/4
Echo 1500B (DF) 6.5ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::22.0ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1
4.9ms0%*AS203993GNA-DC1-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1944.6ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:413.4ms0%AS50673Serverius-as - Serverius Holding B.V., NL
52001:730:2209:7::15.8ms0%AS6830LibertyGlobal - Liberty Global Europe Holding B.V., NL
62001:730:2200::5474:80174.8ms0%AS6830LibertyGlobal - Liberty Global Europe Holding B.V., NL
72001:7f8:1::a504:1095:16.8ms0%-NA
82a03:9d40:ff00:25::150.9ms0%AS41095IPTP - IPTP LTD, GB
92a03:9d40:2701:1::36.8ms0%AS41095IPTP - IPTP LTD, GB
10*-0%-
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---

tracepath -6

 1?: [LOCALHOST]                        0.054ms pmtu 1500
 1:  2a00:8642:42::2                                       2.517ms 
 1:  2a00:8642:42::2                                       1.998ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      4.537ms 
 4:  2a03:3f40::10:41                                      3.503ms 
 5:  no reply
 6:  no reply
 7:  2001:7f8:1::a504:1095:1                              10.695ms asymm  6 
 8:  2a03:9d40:ff00:25::1                                  6.810ms asymm  7 
 9:  2a03:9d40:2701:1::3                                   7.013ms asymm  8 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From ITA host (Karsolink)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 26.6ms
3/4
Echo 1500B (DF) 26.9ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
2*-0%*-
3*-20%-
42a03:b020:1:51::a10.3ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5iptp-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO
2001:7f8:b:100:1d1:a5d4:1095:94
10.5ms0%-NA
62a03:9d40:ff00:16::162.1ms0%AS41095IPTP - IPTP LTD, GB
72a03:9d40:ff00:1::120.7ms0%AS41095IPTP - IPTP LTD, GB
82a03:9d40:ff00:2f::126.4ms20%AS41095IPTP - IPTP LTD, GB
92a03:9d40:ff00:25::164.0ms0%AS41095IPTP - IPTP LTD, GB
102a03:9d40:2701:1::326.2ms0%AS41095IPTP - IPTP LTD, GB
11*-0%-
12*---
13*---
14*---
15*---
16*---
17*---
18*---

Rate-limited ICMPv6: hop 3, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.765ms 
 2:  2a12:d8c0:109f:121::a1                                0.564ms 
 3:  2a12:d8c0:101f:6::1                                  10.170ms 
 4:  2a03:b020:1:51::a                                    11.200ms 
 5:  iptp-v6.mix-it.net                                   11.265ms 
 6:  2a03:9d40:ff00:16::1                                 14.523ms 
 7:  2a03:9d40:ff00:1::1                                  21.372ms 
 8:  2a03:9d40:ff00:2f::1                                 27.164ms 
 9:  2a03:9d40:ff00:25::1                                 26.874ms 
10:  2a03:9d40:2701:1::3                                  26.714ms 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From SLO host (6connect)   echo onlyRFC 4890 ✓

filter likely at: past AS41095 (IPTP) · min PMTU on path: 1500

4/4
Echo small (56B) 20.1ms
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2
0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*-0%*-
32a00:ee1:800:9::12.2ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
42a00:ee0:1:15::21.1ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
5de-cix.iptp.net
2001:7f8::a087:0:1
15.6ms0%-NA
62a03:9d40:ff00:2f::119.9ms0%AS41095IPTP - IPTP LTD, GB
72a03:9d40:ff00:25::119.6ms0%AS41095IPTP - IPTP LTD, GB
82a03:9d40:2701:1::319.7ms0%AS41095IPTP - IPTP LTD, GB
9*-0%-
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.612ms 
 1:  fw1-lju.6connect.com                                  0.626ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    1.016ms 
 3:  2a00:ee1:800:9::1                                     2.203ms 
 4:  2a00:ee0:1:15::2                                      1.387ms asymm  3 
 5:  2a00:ee0:1:15::2                                      1.496ms pmtu 1500
 5:  de-cix.iptp.net                                      14.855ms asymm  9 
 6:  2a03:9d40:ff00:2f::1                                 20.468ms asymm 10 
 7:  2a03:9d40:ff00:25::1                                 19.994ms asymm 11 
 8:  2a03:9d40:2701:1::3                                  20.121ms asymm 12 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 25.8ms
4/4
Echo 1500B (DF) 26.3ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
22a01:260:1::2252.4ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9c.core6.t-2.net
2a01:260:1:1::9c
2.6ms0%*AS34779T-2-AS - T-2, d.o.o., SI
42a01-260-1-1--25.core6.t-2.net
2a01:260:1:1::25
5.1ms0%*AS34779T-2-AS - T-2, d.o.o., SI
52a01-260-1-1--2a.core6.t-2.net
2a01:260:1:1::2a
4.2ms0%*AS34779T-2-AS - T-2, d.o.o., SI
6ae14-420.vie10.core-backbone.com
2a01:4a0:1338:115::1
8.0ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
7ae14-2032.nbg20.core-backbone.com
2a01:4a0:0:2032::2
16.0ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
8ae14-2032.nbg20.core-backbone.com
2a01:4a0:0:2032::2
16.6ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
9*-0%-
10de-cix.iptp.net
2001:7f8::a087:0:1
28.0ms0%-NA
112a03:9d40:ff00:25::123.8ms20%AS41095IPTP - IPTP LTD, GB
122a03:9d40:2701:1::324.5ms0%AS41095IPTP - IPTP LTD, GB
13*-0%-
14*-0%-
15*---
16*---
17*---
18*---

Rate-limited ICMPv6: hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.350ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.424ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.343ms 
 4:  2a01-260-1-1--25.core6.t-2.net                        5.073ms 
 5:  2a01-260-1-1--c.core6.t-2.net                         5.093ms asymm  4 
 6:  ae4-2028.muc20.core-backbone.com                     14.641ms 
 7:  ae4-2028.muc20.core-backbone.com                     13.978ms asymm  6 
 8:  ae14-2032.nbg20.core-backbone.com                    17.934ms asymm  7 
 9:  de-cix.iptp.net                                      29.160ms asymm  8 
10:  2a03:9d40:ff00:2f::1                                 25.227ms asymm 11 
11:  2a03:9d40:ff00:25::1                                 25.436ms asymm 12 
12:  2a03:9d40:2701:1::3                                  25.473ms asymm 13 
13:  2a03:9d40:2701:1::3                                  24.873ms 
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500