The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Thursday, April 14, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 15 Apr, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 354145
Prefixes after maximum aggregation: 160324
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 175148
Total ASes present in the Internet Routing Table: 37308
Prefixes per ASN: 9.49
Origin-only ASes present in the Internet Routing Table: 31284
Origin ASes announcing only one prefix: 15052
Transit ASes present in the Internet Routing Table: 5030
Transit-only ASes present in the Internet Routing Table: 129
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 36
Max AS path prepend of ASN (36992) 29
Prefixes from unregistered ASNs in the Routing Table: 589
Unregistered ASNs in the Routing Table: 258
Number of 32-bit ASNs allocated by the RIRs: 1291
Number of 32-bit ASNs visible in the Routing Table: 994
Prefixes from 32-bit ASNs in the Routing Table: 2182
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 158
Number of addresses announced to Internet: 2411443008
Equivalent to 143 /8s, 187 /16s and 179 /24s
Percentage of available address space announced: 65.1
Percentage of allocated address space announced: 65.1
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 90.5
Total number of prefixes smaller than registry allocations: 146797

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 88133
Total APNIC prefixes after maximum aggregation: 29841
APNIC Deaggregation factor: 2.95
Prefixes being announced from the APNIC address blocks: 85134
Unique aggregates announced from the APNIC address blocks: 37053
APNIC Region origin ASes present in the Internet Routing Table: 4406
APNIC Prefixes per ASN: 19.32
APNIC Region origin ASes announcing only one prefix: 1225
APNIC Region transit ASes present in the Internet Routing Table: 697
Average APNIC Region AS path length visible: 4.6
Max APNIC Region AS path length visible: 20
Number of APNIC region 32-bit ASNs visible in the Routing Table: 48
Number of APNIC addresses announced to Internet: 608879648
Equivalent to 36 /8s, 74 /16s and 196 /24s
Percentage of available APNIC address space announced: 77.2

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079
55296-56319, 131072-132095
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 139579
Total ARIN prefixes after maximum aggregation: 70997
ARIN Deaggregation factor: 1.97
Prefixes being announced from the ARIN address blocks: 112046
Unique aggregates announced from the ARIN address blocks: 45102
ARIN Region origin ASes present in the Internet Routing Table: 14325
ARIN Prefixes per ASN: 7.82
ARIN Region origin ASes announcing only one prefix: 5473
ARIN Region transit ASes present in the Internet Routing Table: 1486
Average ARIN Region AS path length visible: 3.9
Max ARIN Region AS path length visible: 23
Number of ARIN region 32-bit ASNs visible in the Routing Table: 11
Number of ARIN addresses announced to Internet: 797951744
Equivalent to 47 /8s, 143 /16s and 199 /24s
Percentage of available ARIN address space announced: 63.4

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 83914
Total RIPE prefixes after maximum aggregation: 47720
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 77003
Unique aggregates announced from the RIPE address blocks: 50721
RIPE Region origin ASes present in the Internet Routing Table: 15517
RIPE Prefixes per ASN: 4.96
RIPE Region origin ASes announcing only one prefix: 7793
RIPE Region transit ASes present in the Internet Routing Table: 2430
Average RIPE Region AS path length visible: 4.7
Max RIPE Region AS path length visible: 36
Number of RIPE region 32-bit ASNs visible in the Routing Table: 736
Number of RIPE addresses announced to Internet: 466709760
Equivalent to 27 /8s, 209 /16s and 109 /24s
Percentage of available RIPE address space announced: 75.2

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 32350
Total LACNIC prefixes after maximum aggregation: 7453
LACNIC Deaggregation factor: 4.34
Prefixes being announced from the LACNIC address blocks: 31319
Unique aggregates announced from the LACNIC address blocks: 16409
LACNIC Region origin ASes present in the Internet Routing Table: 1435
LACNIC Prefixes per ASN: 21.83
LACNIC Region origin ASes announcing only one prefix: 427
LACNIC Region transit ASes present in the Internet Routing Table: 261
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 21
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 194
Number of LACNIC addresses announced to Internet: 81888128
Equivalent to 4 /8s, 225 /16s and 131 /24s
Percentage of available LACNIC address space announced: 54.2

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 7705
Total AfriNIC prefixes after maximum aggregation: 1833
AfriNIC Deaggregation factor: 4.20
Prefixes being announced from the AfriNIC address blocks: 6063
Unique aggregates announced from the AfriNIC address blocks: 1876
AfriNIC Region origin ASes present in the Internet Routing Table: 446
AfriNIC Prefixes per ASN: 13.59
AfriNIC Region origin ASes announcing only one prefix: 134
AfriNIC Region transit ASes present in the Internet Routing Table: 98
Average AfriNIC Region AS path length visible: 4.8
Max AfriNIC Region AS path length visible: 31
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 5
Number of AfriNIC addresses announced to Internet: 22801664
Equivalent to 1 /8s, 91 /16s and 237 /24s
Percentage of available AfriNIC address space announced: 34.0

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2439 9517 908 Korea Telecom (KIX)
17974 1813 515 29 PT TELEKOMUNIKASI INDONESIA
7545 1545 301 82 TPG Internet Pty Ltd
4755 1446 638 166 TATA Communications formerly
24560 1137 322 203 Bharti Airtel Ltd., Telemedia
4808 1063 2140 293 CNCGROUP IP network: China169
9583 1054 77 495 Sify Limited
9829 1008 870 50 BSNL National Internet Backbo
17488 942 162 98 Hathway IP Over Cable Interne
18101 934 116 139 Reliance Infocom Ltd Internet

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3663 3822 255 bellsouth.net, inc.
4323 2660 1090 396 Time Warner Telecom
1785 1788 681 127 PaeTec Communications, Inc.
18566 1667 336 216 Covad Communications
6478 1623 307 37 AT&T Worldnet Services
20115 1537 1552 641 Charter Communications
19262 1494 4949 297 Verizon Global Networks
7018 1348 6801 876 AT&T WorldNet Services
22773 1298 2865 84 Cox Communications, Inc.
2386 1269 536 912 AT&T Data Communications Serv

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6830 518 1780 320 UPC Distribution Services
34984 508 98 185 BILISIM TELEKOM
29049 467 33 34 AzerSat LLC.
3292 455 2013 392 TDC Tele Danmark
8866 445 134 26 Bulgarian Telecommunication C
20940 442 127 339 Akamai Technologies European
3320 418 7607 364 Deutsche Telekom AG
12479 406 577 6 Uni2 Autonomous System
8402 403 320 11 Corbina telecom
8551 403 353 46 Bezeq International

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1426 265 157 TVCABLE BOGOTA
28573 1246 971 104 NET Servicos de Comunicao S.A
8151 1243 2683 369 UniNet S.A. de C.V.
6503 923 354 72 AVANTEL, S.A.
7303 923 465 148 Telecom Argentina Stet-France
14420 661 53 90 CORPORACION NACIONAL DE TELEC
22047 567 310 15 VTR PUNTO NET S.A.
3816 516 225 98 Empresa Nacional de Telecomun
11172 487 99 81 Servicios Alestra S.A de C.V
27947 481 53 54 Telconet S.A

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8452 838 445 11 TEDATA
24863 778 147 39 LINKdotNET AS number
15475 422 90 8 Nile Online
36992 295 287 12 Etisalat MISR
3741 266 985 227 The Internet Solution
6713 235 215 13 Itissalat Al-MAGHRIB
33776 227 13 5 Starcomms Nigeria Limited
24835 222 78 10 RAYA Telecom - Egypt
29571 161 17 11 Ci Telecom Autonomous system
16637 148 441 86 MTN Network Solutions

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3663 3822 255 bellsouth.net, inc.
4323 2660 1090 396 Time Warner Telecom
4766 2439 9517 908 Korea Telecom (KIX)
23456 2182 641 1190 32-bit ASN transition
17974 1813 515 29 PT TELEKOMUNIKASI INDONESIA
1785 1788 681 127 PaeTec Communications, Inc.
18566 1667 336 216 Covad Communications
6478 1623 307 37 AT&T Worldnet Services
7545 1545 301 82 TPG Internet Pty Ltd
20115 1537 1552 641 Charter Communications

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
4323 2660 2264 Time Warner Telecom
17974 1813 1784 PT TELEKOMUNIKASI INDONESIA
1785 1788 1661 PaeTec Communications, Inc.
6478 1623 1586 AT&T Worldnet Services
4766 2439 1531 Korea Telecom (KIX)
7545 1545 1463 TPG Internet Pty Ltd
18566 1667 1451 Covad Communications
4755 1446 1280 TATA Communications formerly
10620 1426 1269 TVCABLE BOGOTA
11492 1262 1247 Cable One

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
45083 UNALLOCATED 1.45.0.0/16 4808 CNCGROUP IP network:
45083 UNALLOCATED 1.45.92.0/22 4808 CNCGROUP IP network:
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
13746 UNALLOCATED 12.24.56.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.155.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
2.56.0.0/16 44559 E-Rent LLC
24.225.128.0/18 36377 Comcast Telecommunications, I
24.225.192.0/23 36377 Comcast Telecommunications, I
24.225.192.0/18 36377 Comcast Telecommunications, I
24.225.224.0/21 36377 Comcast Telecommunications, I
24.225.237.0/24 36377 Comcast Telecommunications, I
24.225.248.0/21 36377 Comcast Telecommunications, I
31.7.56.0/21 51852 Private Layer INC
31.7.146.0/23 49360 Rp Engineering di Romano Ales
31.7.168.0/21 48057 Company for interactive techn

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:19 /9:12 /10:26 /11:76 /12:219
/13:452 /14:773 /15:1375 /16:11607 /17:5742 /18:9466
/19:19130 /20:25177 /21:25546 /22:33627 /23:32521 /24:185239
/25:1118 /26:1270 /27:696 /28:38 /29:8 /30:2
/31:0 /32:6

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
6389 2260 3663 bellsouth.net, inc.
18566 1644 1667 Covad Communications
6478 1577 1623 AT&T Worldnet Services
4323 1355 2660 Time Warner Telecom
10620 1316 1426 TVCABLE BOGOTA
11492 1211 1262 Cable One
23456 1130 2182 32-bit ASN transition
7011 1062 1161 Citizens Utilities
1785 1058 1788 PaeTec Communications, Inc.
22773 842 1298 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:254 2:65 4:14 5:1 8:348 12:2000
13:1 14:436 15:15 16:3 17:8 20:9
23:5 24:1606 27:718 31:220 32:60 33:3
34:2 37:1 38:763 40:101 41:2395 42:1
44:3 46:849 47:4 49:170 50:358 52:13
55:6 56:2 57:28 58:847 59:480 60:387
61:1237 62:1006 63:1920 64:3902 65:2329 66:4322
67:1810 68:1081 69:2950 70:700 71:345 72:1903
73:1 74:2337 75:299 76:337 77:839 78:690
79:457 80:1089 81:828 82:503 83:456 84:645
85:1065 86:564 87:761 88:340 89:1586 90:181
91:3702 92:514 93:1054 94:1257 95:787 96:453
97:250 98:818 99:35 101:61 103:1 106:1
107:4 108:78 109:948 110:543 111:694 112:324
113:389 114:525 115:681 116:941 117:675 118:802
119:1141 120:291 121:675 122:1630 123:1063 124:1247
125:1265 128:265 129:164 130:172 131:567 132:104
133:20 134:217 135:49 136:213 137:142 138:301
139:103 140:488 141:174 142:397 143:392 144:484
145:53 146:441 147:204 148:594 149:244 150:171
151:187 152:307 153:180 154:3 155:394 156:190
157:354 158:132 159:381 160:315 161:244 162:277
163:164 164:489 165:349 166:514 167:419 168:725
169:154 170:781 171:75 172:1 173:1491 174:529
175:352 177:71 178:850 180:811 181:7 182:419
183:197 184:243 185:1 186:1134 187:828 188:991
189:1003 190:4831 192:5782 193:4815 194:3464 195:2962
196:1207 197:16 198:3569 199:3916 200:5537 201:1490
202:8331 203:8461 204:4130 205:2327 206:2708 207:3026
208:3945 209:3502 210:2728 211:1361 212:1978 213:1726
214:739 215:66 216:4850 217:1659 218:555 219:384
220:1194 221:479 222:340 223:132

End of report
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