AS21056 ASN-WELCOMEITALIA Vianova S.p.A

AS overview

Test target: 2a00:14f8::1 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a00:14f8::/32

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 / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a00:14f8::1`	prb	✓	✓	refused	refused	-	✓	✓	refused	refused	-	✓	✓	refused	refused	-	✓	✓	?	?	-	✓	✓	refused	refused	-	✓	✓	refused	refused	-	✓	✓	refused	refused	-

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

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2016-08-10. IPv6 LAN: 2001:7f8:b:100:1d1:a5d2:1056:43. Locations: -.

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a00:14f8::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS21056 /32 maxLen 64 (ripe)

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

At least one router inside AS21056's announced prefix replied during the random-target probe. Hop(s): 2a00:14f8:300:10::f:26, 2a00:14f8:300:110::f:1, 2a00:14f8:300:110::f:1f, 2a00:14f8:300:110::f:27, 2a00:14f8:300:110::f:2d. These are candidate targets for direct testing.

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 2026-09-23T12:00:25Z

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 ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) openRFC 4890 ✓

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

4/4

Echo small (56B) 42.6ms

4/4

Echo 1500B (DF) 42.6ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.2ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.2ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.3ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	12.8ms	0%	-
5	RT.THV.PAR.FR.retn.net 2a02:2d8::57f5:e0b9	33.9ms	0%	AS9002	RETN-AS - RETN Limited, GB
6	vianova-spa.par.franceix.net 2001:7f8:54::2:160	50.2ms	0%	-	NA
7	2a00:14f8:300:110::f:36	41.5ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT
8	2a00:14f8:300:10::f:15	46.7ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  _gateway                                              0.460ms 
 1:  _gateway                                              0.634ms 
 2:  sox-pn.sox.rs                                         1.351ms 
 3:  2001:7f8:1e:8::3d                                     1.540ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       13.605ms asymm  3 
 5:  RT.THV.PAR.FR.retn.net                               36.288ms asymm  4 
 6:  vianova-spa.par.franceix.net                         50.726ms asymm  5 
 7:  2a00:14f8:300:110::f:34                              41.036ms asymm  6 
 8:  2a00:14f8:300:10::f:15                               43.216ms reached
     Resume: pmtu 1500 hops 8 back 7

From DE host (Berlin) openRFC 4890 ✓

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

4/4

Echo small (56B) 35.6ms

4/4

Echo 1500B (DF) 35.7ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.7ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-150.cr10.fra01.lwlcom.net 2a00:c380:b200:230::174	9.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-20.cr10.fra07.lwlcom.net 2a00:c380:b200:230::31	10.0ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	*	-	60%	-
6	2001:4c08::1f	37.3ms	0%	AS3356	LEVEL3 - Level 3 Parent, LLC, US
7	2001:1900:5:2:2::415e	45.3ms	0%	AS3356	LEVEL3 - Level 3 Parent, LLC, US
8	2a00:14f8:300:111::f:11	37.4ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

Rate-limited ICMPv6: hop 5 (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                  0.714ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.679ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.334ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.784ms asymm  7 
 4:  ae0-20.cr10.fra07.lwlcom.net                         10.867ms asymm  6 
 5:  no reply
 6:  2001:4c08::1f                                        47.245ms asymm  8 
 7:  2001:1900:5:2:2::415e                                36.408ms asymm 10 
 8:  2a00:14f8:300:111::f:101                             35.693ms reached
     Resume: pmtu 1500 hops 8 back 9

From DE host (Düsseldorf) openRFC 4890 ✓

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

4/4

Echo small (56B) 17.8ms

4/4

Echo 1500B (DF) 19.8ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.2ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1	6.4ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1	51.5ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
4	lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2	0.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2	0.5ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	ipv6.de-cix.fra.de.as21056.welcomeitalia.it 2001:7f8::5240:0:1	14.9ms	0%	-	NA
7	2a00:14f8:300:110::f:2f	13.7ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT
8	2a00:14f8:300:10::f:9	17.6ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

tracepath -6

 1?: [LOCALHOST]                        0.010ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.480ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.444ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.162ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.445ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.392ms 
 6:  ipv6.de-cix.fra.de.as21056.welcomeitalia.it          13.380ms 
 7:  2a00:14f8:300:110::f:2f                              13.250ms 
 8:  2a00:14f8:300:10::f:15                               17.734ms reached
     Resume: pmtu 1500 hops 8 back 8

From NL host (go6lab) openRFC 4890 ✓

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

4/4

Echo small (56B) 27.7ms

4/4

Echo 1500B (DF) 27.8ms

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	0.6ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	6.8ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	4.5ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:33	8.4ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	ae22-404.ams10.core-backbone.com 2a01:4a0:1338:155::1	7.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
6	ae16-2074.fra10.core-backbone.com 2a01:4a0:0:2074::3	13.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	13.2ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ipv6.de-cix.fra.de.as21056.welcomeitalia.it 2001:7f8::5240:0:1	24.5ms	0%	-	NA
9	2a00:14f8:300:110::f:2f	22.5ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT
10	2a00:14f8:300:10::f:15	25.2ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1500
 1:  2a00:8642:42::2                                       4.609ms 
 1:  2a00:8642:42::2                                       1.692ms 
 2:  gw.friends.steffann.nl                                2.673ms 
 3:  2a00:1ca8:1::194                                      7.998ms 
 4:  2a03:3f40::10:33                                      6.371ms 
 5:  ae22-404.ams10.core-backbone.com                      6.892ms 
 6:  ae16-2074.fra10.core-backbone.com                    13.446ms 
 7:  ae2-2021.fra20.core-backbone.com                     12.412ms 
 8:  ipv6.de-cix.fra.de.as21056.welcomeitalia.it          22.497ms asymm  7 
 9:  2a00:14f8:300:110::f:2f                              28.815ms asymm  8 
10:  2a00:14f8:300:10::f:15                               28.756ms reached
     Resume: pmtu 1500 hops 10 back 9

From ITA host (Karsolink) openRFC 4890 ✓

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

4/4

Echo small (56B) 30.8ms

3/4

Echo 1500B (DF) 21.1ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	*	-	-	-
3	*	-	-	-
4	welcomeitalia-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:a5d2:1056:43	8.8ms	0%	-	NA
5	2a00:14f8:300:110::f:1f	16.8ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT
6	2a00:14f8:300:10::f:11	21.1ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

tracepath -6

 1?: [LOCALHOST]                        0.014ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.676ms 
 3:  2a12:d8c0:101f:103::1                                 8.560ms 
 4:  welcomeitalia-v6.mix-it.net                          22.061ms 
 5:  2a00:14f8:300:110::f:27                              17.311ms asymm  7 
 6:  2a00:14f8:300:10::f:15                               21.329ms reached
     Resume: pmtu 1500 hops 6 back 8

From SLO host (6connect) openRFC 4890 ✓

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

4/4

Echo small (56B) 27.0ms

3/4

Echo 1500B (DF) 27.1ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	2a00:ee1:800:9::1	1.9ms	-	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
4	2a00:ee0:1:15::2	1.3ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	ipv6.de-cix.fra.de.as21056.welcomeitalia.it 2001:7f8::5240:0:1	23.9ms	0%	-	NA
6	2a00:14f8:300:110::f:2d	23.2ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT
7	2a00:14f8:300:10::f:15	27.9ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.622ms 
 1:  fw1-lju.6connect.com                                  0.754ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.242ms 
 4:  2a00:ee0:1:10::2                                      1.539ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.768ms pmtu 1500
 5:  ipv6.de-cix.fra.de.as21056.welcomeitalia.it         313.770ms asymm  9 
 6:  2a00:14f8:300:110::f:2d                              31.839ms asymm 10 
 7:  2a00:14f8:300:10::f:15                               28.310ms reached
     Resume: pmtu 1500 hops 7 back 11

From SLO host (T-2) openRFC 4890 ✓

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

4/4

Echo small (56B) 49.4ms

4/4

Echo 1500B (DF) 49.5ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	2a01:260:1::225	15.4ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	14.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	*	-	0%*	-
5	*	-	0%	-
6	*	-	0%	-
7	*	-	30%	-
8	*	-	-	-
9	ipv6.de-cix.fra.de.as21056.welcomeitalia.it 2001:7f8::5240:0:1	54.8ms	0%	-	NA
10	2a00:14f8:300:10::f:9	57.0ms	0%	AS21056	ASN-WELCOMEITALIA - Vianova S.p.A, IT

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

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       2.063ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.963ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        3.344ms asymm  3 
 5:  be7.core2.fra2.he.net                                38.829ms 
 6:  be1.core2.fra2.he.net                                39.105ms asymm  5 
 7:  no reply
 8:  ipv6.de-cix.fra.de.as21056.welcomeitalia.it          44.908ms 
 9:  ipv6.de-cix.fra.de.as21056.welcomeitalia.it          44.595ms asymm  8 
10:  2a00:14f8:300:110::f:2f                              48.503ms asymm  9 
11:  2a00:14f8:300:10::f:9                                49.275ms reached
     Resume: pmtu 1500 hops 11 back 10